Definitions for: Theta

[n] the 8th letter of the Greek alphabet

Webster (1913) Definition: The"ta, n. [L., fr. Gr. qh^ta, the Greek letter [theta],
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.

Theta function (Math.), one of a group of functions used in
developing the properties of elliptic functions.

See Also: alphabetic character, Greek alphabet, letter, letter of the alphabet

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