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 September 19, Meghan O'Gieblyn, “The Most Unread Book Ever Acclaimed”, in The Paris Review:

     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

• → Malay: teta

Borrowed from Ancient Greek θῆτα (thêta).

• IPA^(key): (Central, Balearic) [ˈtɛ.tə]
• IPA^(key): (Valencian) [ˈte.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, 2024
• “theta” in Diccionari normatiu valencià, Acadèmia Valenciana de la Llengua.

• théta

Borrowed from Ancient Greek θῆτα (thêta).

• IPA^(key): [ˈtxɛːta]
• IPA^(key): [ˈtɛːta]

theta n or f

1. theta (Greek letter)

when feminine:

Indeclinable when neuter.

From the Ancient Greek θῆτα (thêta).

• IPA^(key): /ˈtɛ.ta/[1]
• Rhymes: -ɛta
• Hyphenation: thè‧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 Polish dictionaries at PWN

theta f (plural thetas)

1. Pre-reform spelling (until Brazil 1943/Portugal 1911) of teta.

Borrowed 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