Copyright © Philip M. Parker, INSEAD. Terms of Use.
Definition: Tetra |
TetraNoun1. Brightly colored tropical freshwater fishes. Source: WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved. |
Date "tetra" was first used in popular English literature: sometime before 1596. (references) |
(From Wikipedia, the free Encyclopedia)
TErrestial Trunked RAdio (TETRA) is a specialist cell phone and walkie talkie standard used by police, ambulance and military. Its main advantage over technologies such as GSM are:Its main disadvantages are:
- the much lower frequency used, which permits very high levels of geographic coverage with a smaller number of transmitters, cutting infrastructure cost,
- the fact that its infrastructure can be separated from that of the public cellphone network, and made substantially more diverse and resilient by the fact that base stations can be some distance from the area served, and that
- unlike most cellular technologies, TETRA can also be used in a point-to-point mode if the infrastructure fails.
TETRA uses Time Division Multiple Access (TDMA) with four user channels on one radio carrier and 25 kHz spacing between carriers. Both point-to-point and point-to-multipoint transfer can be used. Mobile Stations (MS) can communicate Direct Mode or using infrastructure made of TETRA Base Stations (TBS).
- it can only support a much lower teledensity in a given area, compared to GSM and similar technologies (which is not a problem in the applications for which it is used, but mostly limits it to these applications)
- handsets are more expensive (about 750 EUR in 2003), due to the reduced economies of scale compared to mass-market cellphones
All traffic is normally encrypted. TETRA provides both transfer encryption and end-to-end encryption.
In Europe, TETRA uses frequencies:
TETRA is an ETSI standard, first version published 1995.
- Emergency systems 380-383 MHz, 390-393 MHz (also 383-395 MHz and 393-395 MHz)
- Civil systems 410-430 MHz, 870-876 MHz / 915-921 MHz, 450-470 MHz, 385-390 MHz / 395-399,9 MHz,
External Links
- European Standards Organization - Telecom Standards - TETRA
- TETRA Memorandum of Understanding - TETRA Facts
Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Terrestial Trunked Radio."
| The following table is compiled from various sources, across various languages. When English abbreviations or acronyms come from a non-English source, this is noted. | |||
| Entry | Source | Expression | Field |
TETRA | Dutch | Trans European Trunked Radio | Post & Telecom |
TETRA | English | Terrestrial Trunk Radio | Post & Telecom |
TETRA | Finnish | "Trans European Trunked Radio | Post & Telecom |
TETRA | French | Radiocommunications européennes à ressources partagées | Post & Telecom |
TETRA | German | Transeuropäischer Bündelfunk | Post & Telecom |
TETRA | Italian | Sistema transeuropeo di comunicazioni a concentrazione di canali | Post & Telecom |
TETRA | Portuguese | Radiocomunicações transeuropeias com recursos partilhados | Post & Telecom |
TETRA | Spanish | Sistema europeo de radiocomunicaciones de radiotelefonía de grupo cerrado | Post & Telecom |
TETRA | Swedish | Alleuropeisk trunkerad radio | Post & Telecom |
Source: compiled by the editor, based on several corpora (additional references). | |||
Crosswords: Tetra |
| Specialty definitions using "tetra": Second Generation Mobile Systems. (references) |
| Non-English Usage: "Tetra" is also a word in the following language with English translations in parentheses. Portuguese (TETRA, Trans European Trunked Radio). |
| Domain | Title | ||
References | |||
Books |
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Periodicals |
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Source: compiled by the editor from various references; see credits. | |||
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| "Tetra" by Peter Skadberg Commentary: "Head and tail light tetra. HIGH RES PHOTO FREE UPON REQUEST." |
Source: photographs selected by the editor, with permission from the photographers. |
| Subject | Topic | Quote |
Economic History | Ukraine | Tetra Laval manufactures and sells a wide range of equipment, but has been most successful selling packaging equipment for liquids (milk and juices). (references) |
Source: compiled by the editor from ICON Group International, Inc.; see credits. | ||
| "Tetra" is generally used as a noun (proper) -- approximately 72.00% of the time. "Tetra" is used about 50 times out of a sample of 100 million words spoken or written in English. Its rank is based on over 700,000 words used in the English language. Some parts-of-speech are not covered due to the samples used by the British National Corpus. (note: percents less than one-hundredth of one percent have been omitted) |
| Parts of Speech | Percent | Usage per 100 Million Words | Rank in English |
| Noun (proper) | 72% | 36 | 57,479 |
| Noun (singular) | 28% | 14 | 93,893 |
| Total | 100.00% | 50 | N/A |
Source: compiled by the editor from several corpora; see credits.
| Country | Name | Country | Name |
| Japan | Tetra Co., Ltd. | USA | Tetra Tech, Inc. |
| (more examples...) |
Source: compiled by the editor from Icon Group International, Inc.
Expression using "tetra": cardinal tetra. Additional references. | |
| Hyphenated Usage | |
Beginning with "tetra": tetra-acetic, tetra-ethyl, tetra-pack, Tetra-pak, tetra-propylene, tetra-radial, tetra-structure. | |
| Source: compiled by the editor from various references; see credits. | |
| The following statistics estimate the number of searches per day across the major English-language search engines as identified by various trade publications. Hyperlinks lead to commercial use of the expression at Amazon.com. |
| Expression | Frequency per Day | Expression | Frequency per Day |
tetra | 404 | tetra training | 10 |
tetra tech | 157 | tetra fish food | 9 |
neon tetra | 103 | disease neon tetra | 9 |
tetra fish | 103 | neon tetra breeding | 9 |
tetra pak | 80 | game tetra | 9 |
tetra pond | 47 | black skirt tetra | 9 |
tetra fish.com | 39 | diamond tetra | 9 |
tetra technology | 27 | nose rummy tetra | 8 |
tetra pack | 23 | black neon tetra | 8 |
tetra tech inc | 22 | tetra laval | 8 |
tetra master | 19 | tetra second nature | 8 |
neon tetra fish | 16 | emperor tetra | 7 |
tetra pond filter | 14 | pristella tetra | 7 |
compact tetra | 14 | radio tetra | 7 |
cardinal tetra | 13 | lemon tetra | 7 |
tetra filter | 13 | glowlight tetra | 7 |
serpae tetra | 12 | tetra aquarium | 6 |
black tetra | 12 | austin tetra | 6 |
congo tetra | 11 | tetra product | 6 |
tetra tec | 11 | red eye tetra | 6 |
| Source: compiled by the editor from various references; see credits. | |||
| Language | Translations for "tetra"; alternative meanings/domain in parentheses. | |
Chinese | 四 (four, Tetra-). (various references) | |
Danish | Trans European Trunked Radio (Trans European Trunked Radio), TETRA (Trans European Trunked Radio). (various references) | |
Dutch | Trans European Trunked Radio (Trans European Trunked Radio), TETRA (Trans European Trunked Radio). (various references) | |
Finnish | TETRA (Trans European Trunked Radio), "Trans European Trunked Radio (Trans European Trunked Radio). (various references) | |
French | TETRA, radiocommunications européennes à ressources partagées. (various references) | |
German | transeuropäischer Bündelfunk (Trans European Trunked Radio), TETRA (carbon tetrachloride, CCl4, fluorocarbon-10, perchloromethane, tetrachloromethane, Trans European Trunked Radio). (various references) | |
Greek | τετραπροπυλένιο (tetrapropylene, tetra-propylene). (various references) | |
Italian | TETRA (Trans European Trunked Radio), Sistema transeuropeo di comunicazioni a concentrazione di canali (Trans European Trunked Radio). (various references) | |
Pig Latin | etratay.(various references) | |
Portuguese | TETRA (Trans European Trunked Radio), radiocomunicações transeuropeias com recursos partilhados (Trans European Trunked Radio). (various references) | |
Russian | тетра. (various references) | |
Spanish | TETRA (Trans European Trunked Radio). (various references) | |
Swedish | TETRA (Trans European Trunked Radio), alleuropeisk trunkerad radio (Trans European Trunked Radio). (various references) | |
Turkish | dörtlü (four, foursome, quad, quadr-, quadraphonic, quadripartite, quadro-, quadrophonic, quadruple, quadruplet, quart, quartet, quartette, quater-, quaternary, Square, tetra-, tetrad), dört (four, quadr-, quadro-, quadruple, quater-, quaternary, tetra-, tetrad). (various references) | |
| Source: compiled by the editor from various translation references. | ||
Derivations | |
Words beginning with "tetra": tetracaine, tetracaines, tetrachloride, tetrachlorides, tetrachord, tetrachords, tetracid, tetracids, tetracycline, tetracyclines, tetrad, tetradic, tetradrachm, tetradrachms, tetrads, tetradynamous, tetrafluoride, tetrafluorides, tetragon, tetragonal, tetragonally, tetragons, tetragrammaton, tetragrammatons, tetrahedra, tetrahedral, tetrahedrally, tetrahedrite, tetrahedrites, tetrahedron, tetrahedrons, tetrahydrocannabinol, tetrahydrocannabinols, tetrahydrofuran, tetrahydrofurans, tetrahymena, tetrahymenas, tetralogies, tetralogy, tetramer, tetrameric, tetramerous, tetramers, tetrameter, tetrameters, tetramethyllead, tetramethylleads, tetraploid, tetraploidies, tetraploids, tetraploidy. (additional references) | |
Words containing "tetra": allotetraploid, allotetraploidies, allotetraploids, allotetraploidy, autotetraploid, autotetraploidies, autotetraploids, autotetraploidy, chlortetracycline, chlortetracyclines, ethylenediaminetetraacetate, ethylenediaminetetraacetates, hexamethylenetetramine, hexamethylenetetramines, oxytetracycline, oxytetracyclines, pentylenetetrazol, pentylenetetrazols. (additional references) | |
| |
"Tetra" is suggested in spellcheckers for the following: cetra, Chettri, erta, etra, Ettori, Ettra, Ettre, metra, tatra, tearra, teart, Teatre, tefra, tenra, Tentara, terat, tert, tertia, terza, teta, tetar, Tethra, tetrax, tetri, textra, tfta, Tigra, Tishri, titar, titera, Titma, titre, Tocra, torta, totar, totara, totora, Treta, Tsektran, tter, ttr, ttttaa, ttwa, Tueart, tutar, tutrix, tutta, Tweirat, Tytgat. (additional references) | |
| Source: compiled by the editor, based on several corpora (additional references). | |
| # of Phoneme Matches | Pronunciation | Word(s) rhyming with "tetra" (pronounced te"tru) |
| 3 | -t r u | contra, extra, mantra, orchestra, spectra, ultra. |
Source: compiled by the editor (additional references); see credits. | ||
Scrabble® Enable2K-Verified Anagrams | |
Direct Anagrams: tater, treat. | |
| Words within the letters "a-e-r-t-t" | |
-1 letter: rate, tare, tart, tate, tear, teat, tret. | |
-2 letters: are, art, ate, att, ear, eat, era, eta, rat, ret, tae, tar, tat, tea, tet. | |
-3 letters: ae, ar, at, er, et, re, ta. | |
| Words containing the letters "a-e-r-t-t" | |
+1 letter: attire, batter, fatter, hatter, latter, matter, natter, patter, ratite, ratted, ratten, ratter, rattle, rotate, stater, target, tarted, tarter, taster, taters, tatter, tauter, tetrad, tetras, threat, treats, treaty, watter, yatter. | |
+2 letters: abetter, abettor, abutter, arietta, ariette, artiest, artiste, attired, attires, attrite, batters, battery, battier, battler, beretta, biretta, blatter, brattle, cattery, cattier, chatter, citrate, clatter, curtate, detract, dratted, entrant, entreat, estreat, extract, fattier, flatter, garotte, hatters, intreat, iratest, iterant, iterate, martlet, matters, mattery, natters, nattier, nitrate, outrate, partite, partlet, pattern, patters, platter, prattle, quartet, ratchet, ratites, ratteen, rattens, ratters, rattier, rattled, rattler, rattles, regatta, reptant, restart, restate, retaste, retract, retreat, rotated, rotates, scatter, shatter, smatter, spatter, starets, starlet, started, starter, startle, staters, stature, stretta, striate, swatter, tabaret, taboret, tapster, targets, tartest, tartlet, tartufe, tasters, tastier, tatters, tattier, tattler, taunter, teacart, ternate, tertial, tertian, tetrads, theater, theatre, thereat, threats, titrate, toaster, traject, treated, treater, tuatera, tutelar, yatters. | |
| Source: compiled by the editor from various references; see credits. SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. | |
| 1. Definition 2. Crosswords 3. Usage: Commercial 4. Images: Slideshow | 5. Images: Digital Art 6. Quotations: Non-fiction 7. Usage Frequency 8. Names: Company Usage | 9. Expressions 10. Expressions: Internet 11. Translations: Modern 12. Abbreviations | 13. Acronyms 14. Derivations 15. Rhymes 16. Anagrams | 17. Bibliography |
Copyright © Philip M. Parker, INSEAD. Terms of Use.
