theta

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theta¹

  • /ˈθiːtə/ UK
  • /ˈθeɪtə/ Canada, US
  • [ˈθeɪɾə] Canada, US
  • /ˈθitə/ Canada, US
  • /ˈθæɪtə/ Australia, New Zealand
  • [ˈθæɪɾə] Australia, New Zealand
  • /ˈθeɪ.ta/ Hong Kong
  • [fei̯˥ tʰaː˩] Hong Kong

Rhymes with -iːtə, -eɪtə

Where it comes from

Borrowed from Ancient Greek θῆτα (thêta).

noun thetas

  1. The eighth letter of the Modern Greek alphabet, ninth in Old Greek: Θ, θ.
  2. The measure of an angle.
  3. broadly Pitch angle; the angle between an aircraft's longitudinal axis and the horizontal plane.

    Similar: deck angle

  4. The sensitivity of the value of a derivative with respect to time; the "time decay".
  5. Designating a level of brain activity as measured by electroencephalography having a frequency of between four and seven cycles per second (associated with drowsiness in adults). The reader is less likely to throw the book down in a fit of disgust than she is to be lulled into a theta state, a highway hypnosis induced by page after page of incantatory prose.
  6. The voiceless dental fricative represented by θ.

Theta²

noun Thetas

  1. US, colloquial A member of the Kappa Alpha Theta sorority.

Thesaurus

Closest in meaning: phi, iota, thee, upsilon, tythe, thetatron, tetragram, tetractys, tau cross, tho., tetragramme, trgl., tithe, tetragraph, threy, thou

Translations

Every language

noun Greek letter

Españolzeta, theta, tita
한국어테타 teta
日本語テータ tēta, シータ shīta
中文西塔 xītǎ
Portuguêsteta
Françaisthêta
DeutschTheta
Ελληνικάθήτα thíta
Русскийте́та tɛ́ta
العربيةثِيتَا ṯītā
עבריתטֵיתָא téta

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MLA

"theta." Wiktionary, via Micwyn, micwyn.com/word/theta. Accessed 6 Nov. 2026.

APA

theta. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/theta

Chicago

"theta." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/theta.

BibTeX
@misc{theta_2026,
  title = {theta},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/theta},
  urldate = {2026-11-06}
}