theta.
The eighth letter of the Modern Greek alphabet, ninth in Old Greek: Θ, θ.
Meaning & usage
The eighth letter of the Modern Greek alphabet, ninth in Old Greek: Θ, θ.
The measure of an angle.
Pitch angle; the angle between an aircraft's longitudinal axis and the horizontal plane.
The sensitivity of the value of a derivative with respect to time; the "time decay".
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 voiceless dental fricative represented by θ.
Where this word comes from
Borrowed from Ancient Greek θῆτα (thêta).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.