theta

Meanings

Plural: thetas

Noun

• the 8th letter of the Greek alphabet
• 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.

Synonyms

deck angle

Related Words

alpha, beta, chi, delta, epsilon, eta, gamma, iota, kappa, lambda, mu, nu, omega, omicron, phi, pi, psi, rho, sigma, tau, upsilon, xi, zeta