theta

Fetched 2026-10-26 (cache).

Synonyms: theca, thema, theia, thet, theda, thea, thera, teta, heta, the a, cheta

Antonyms: theca, thema, theia, thet, theda, thea, thera, teta, heta, the a, cheta

Related words from Datamuse; suggestions, not definitions.

Noun

1. The eighth letter of the [[Modern Greek]] alphabet, ninth in Old Greek: Θ, θ.
2. {{lb|en|mathematics}} The [[measure]] of an [[angle]].
3. {{lb|en|aviation|by extension}} {{cap|pitch}} [[angle]]; the angle between an [[aircraft]]'s [[longitudinal]] [[axis]] and the [[horizontal]] [[plane]].
4. {{lb|en|finance}} The [[sensitivity]] of the [[value]] of a [[derivative]] with respect to time; the "time decay".
5. {{lb|en|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).
6. {{lb|en|phonology}} The [[voiceless]] [[dental]] [[fricative]] represented by {{l|mul|θ}}.

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.