noun. The eighth letter of the Greek alphabet.

noun. A letter of the Greek alphabet corresponding to the English th in thin, etc.

noun. A sort of complication of an exponential function, being expressed by a series from n =—∞ to n = + ∞ of terms the logarithm of each of which is na + 2 na. A theta function of several variables, x₁, x₂, … x_n, is Σ exp. (φ + Σmx_n x_n), where φ is a quadratic function of the constants m₁, m₂, … m_n.

noun. A function which occurs in probabilities, and is expressed by the integral fe—tdt.

noun. As used in formulæ of mathematics and engineering, theta (θ) usually denotes:

noun. the entropy, or thermodynamic function or factor by which the absolute temperature is to be multiplied to indicate an amount of heat energy.

noun. The angle, in angular measure, or at the center, through which a radius vector has swept from a zero position, or through which a line has swept in a rotation.

noun. A letter of the Greek alphabet corresponding to th in English; -- sometimes called the unlucky letter, from being used by the judges on their ballots in passing condemnation on a prisoner, it being the first letter of the Greek qa`natos, death.

noun. one of a group of functions used in developing the properties of elliptic functions.

noun. the name for the eighth letter οf the Modern Greek alphabet, ninth in Old Greek.

noun. The measure of an angle.

noun. the 8th letter of the Greek alphabet

"If you are reading something, language areas oscillate in theta frequency allowing high-gamma-related neural activity in individual neurons to transmit information, said Knight."

double theta function  theta function  

theta wave  

alphabetic character  letter  letter of the alphabet  

Beta  Zeta  beta  data  peseta  

Vega  alpha  convexity  cosmic-ray  delta