First Known Use: 15th century
Dictionary
theta
noun the·ta \ˈthā-tə, chiefly British ˈthē-tə\
Definition of THETA
1
: the 8th letter of the Greek alphabet — see alphabet table
2
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Origin of THETA
Middle English, from Latin, from Greek thēta, of Semitic origin; akin to Hebrew ṭēth teth
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