theta

1. The eighth letter of the Modern Greek alphabet, ninth in Old Greek: Θ, θ.

   Theta

   те́таtɛ́ta, фи́таfíta

   те́таtéta

   the 8th letter of the Greek alphabet

2. The measure of an angle.

3. (ширше)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).

6. The voiceless dental fricative represented by θ.

1. I belong to the Theta Chi fraternity.

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2. Theta is the ninth letter of the Greek Alphabet.

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3. Honor societies, fraternities and sororities use Greek letters such as Theta to name and differentiate each other.

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