theta

Borrowed from Ancient Greek θῆτα (thêta).

• (UK) IPA^(key): /ˈθiːtə/
• (US, Canada) IPA^(key): /ˈθeɪtə/

• Audio (US)

  (file)

• (Hong Kong) IPA^(key): /ˈθeɪ.ta/, [fei̯˥ tʰaː˩]
• Rhymes: (UK) -iːtə, (US, Canada) -eɪtə

theta (plural thetas)

1. The eighth letter of the Modern Greek alphabet, ninth in Old Greek: Θ, θ.
2. (mathematics) The measure of an angle.
3. (aviation, by extension) Pitch angle; the angle between an aircraft's longitudinal axis and the horizontal plane.
4. (finance) The sensitivity of the value of a derivative with respect to time; the "time decay".
5. (biology) 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).
   • 2018, Meghan O'Gieblyn, "The Most Unread Book Ever Acclaimed", The Paris Review, 19 September:

     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. (phonology) The voiceless dental fricative represented by θ.

• (measure of derivative price sensitivity): Greeks (includes list of coordinate terms)

(pitch angle of an aircraft):

• alpha
• beta
• gamma

• theta wave
• thetan

• → Malay: teta

From the Ancient Greek θῆτα (thêta).

• (Balearic, Central) IPA^(key): /ˈtɛ.tə/
• (Valencian) IPA^(key): /ˈtɛ.ta/

theta f (plural thetes)

1. theta; the Greek letter Θ (lowercase θ).

• “theta” in Diccionari de la llengua catalana, segona edició, Institut d’Estudis Catalans.
• “theta”, in Gran Diccionari de la Llengua Catalana, Grup Enciclopèdia Catalana, 2023
• “theta” in Diccionari normatiu valencià, Acadèmia Valenciana de la Llengua.

• théta

From the Ancient Greek θῆτα (thêta).

• IPA^(key): [ˈtɛta]

theta n

1. theta (Greek letter)

From the Ancient Greek θῆτα (thêta).

• IPA^(key): /ˈte.ta/
• Rhymes: -eta
• Hyphenation: thé‧ta

theta m or f (invariable)

1. theta (Greek letter)

theta

1. reliable
2. trustworthy

Borrowed from Ancient Greek θῆτα (thêta), from Phoenician 𐤈‬‎ (ṭ‬ /ṭēt/).

• IPA^(key): /ˈtɛ.ta/

• Audio

  (file)

• Rhymes: -ɛta
• Syllabification: the‧ta

theta f

1. theta (Greek letter Θ, θ)

• theta in Wielki słownik języka polskiego, Instytut Języka Polskiego PAN
• theta in Polish dictionaries at PWN

theta f (plural thetas)

1. Obsolete spelling of teta (used in Portugal until September 1911 and in Brazil until the 1940s).

From Ancient Greek θῆτα (thêta).

• IPA^(key): /ˈteta/ [ˈt̪e.t̪a]
  • Rhymes: -eta
• IPA^(key): /ˈtita/ [ˈt̪i.t̪a]
  • Rhymes: -ita

theta f (plural thetas)

1. theta; the Greek letter Θ, θ

   Synonyms: zeta, tita