Dictionary

theta en · NOUN

Pronunciation

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

Etymology

Borrowed from Ancient Greek θῆτα (thêta).

Meanings

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.
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. 2018 September 19, Meghan O'Gieblyn, “The Most Unread Book Ever Acclaimed”, in The Paris Review:
6. The voiceless dental fricative represented by θ.

Forms

Coordinates

gamma · alpha · beta

Deriveds

antitheta · Ramanujan theta function · theta pinch · theta meditation · theta-delta · theta wave · theta function · thetatron · theta rhythm · entheta · thetaprobe · theta graph · thetaform · thetan · theta role · theta join

Descendants

teta

Hypernyms

Greeks (measure of derivative price sensitivity)

Synonyms

deck angle

Translations (37)

hu théta (Greek letter) · arc ܛܝܬܐ (Greek letter) · is þeta (Greek letter) · tl teta (Greek letter) · tr teta (Greek letter) · ms teta (Greek letter) · ja テータ (Greek letter) · mr थीटा (Greek letter) · grc θῆτα (Greek letter) · es tita (Greek letter) · ia theta (Greek letter) · cmn 西塔 (Greek letter) · fi theeta (Greek letter) · ja シータ (Greek letter) · ca theta (Greek letter) · ko 테타 (Greek letter) · ar ثِيتَا (Greek letter) · eo teto (Greek letter) · hy թետա (Greek letter) · pt teta (Greek letter) · ru те́та (Greek letter) · mi heitā (Greek letter) · es theta (Greek letter) · pl theta (Greek letter) · de Theta (Greek letter) · uk те́та (Greek letter) · sv theta (Greek letter) · he טֵיתָא (Greek letter) · acw ثيتا (Greek letter) · ast theta (Greek letter) · nl thèta (Greek letter) · fr thêta (Greek letter) · ru фи́та (Greek letter) · da theta (Greek letter) · es zeta (Greek letter) · el θήτα (Greek letter) · mr थेटा (Greek letter)