Theta

//ˈθeɪtə// noun, slang

noun, slang ·Moderate ·High school level

Definitions

Noun
  1. 1
    The eighth letter of the Modern Greek alphabet, ninth in Old Greek: Θ, θ.
  2. 2
    A member of the Kappa Alpha Theta sorority. US, colloquial
  3. 3
    the 8th letter of the Greek alphabet wordnet
  4. 4
    The measure of an angle.
  5. 5
    Pitch angle; the angle between an aircraft's longitudinal axis and the horizontal plane. broadly
Show 3 more definitions
  1. 6
    The sensitivity of the value of a derivative with respect to time; the "time decay".
  2. 7
    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."

  3. 8
    The voiceless dental fricative represented by θ.

Synonyms

All synonyms
deck angletheta variant

Example

More examples

"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."

Etymology

Borrowed from Ancient Greek θῆτα (thêta).

Related phrases

Ramanujan theta functiontheta functiontheta graphtheta jointheta meditationtheta pinchtheta rhythmtheta roletheta wavetheta-deltamodern greek

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.