Main Entry:

the·ta

Pronunciation:

\ˈthā-tə, chiefly British ˈthē-tə\

Function:

noun

Etymology:

Middle English, from Latin, from Greek thēta, of Semitic origin; akin to Hebrew ṭēth teth

Date:

15th century

1 : the 8th letter of the Greek alphabet — see alphabet table 2 : theta rhythm