Definitions from Wiktionary (Theta)

▸ noun:  The eighth letter of the Modern Greek alphabet, ninth in Old Greek: Θ, θ.
▸ noun:  (mathematics) The measure of an angle.
▸ noun:  (aviation, by extension) Pitch angle; the angle between an aircraft's longitudinal axis and the horizontal plane.
▸ noun:  (finance) The sensitivity of the value of a derivative with respect to time; the "time decay".
▸ noun:  (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).
▸ noun:  (phonology) The voiceless dental fricative represented by θ.
▸ noun:  (US, colloquial) A member of the Kappa Alpha Theta sorority.
▸ Also see theta

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