Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

theta

play
noun the·ta \ˈthā-tə, chiefly British ˈthē-tə\

Definition of theta

  1. 1 :  the 8th letter of the Greek alphabet — see alphabet table

  2. 2 :  theta rhythm



Origin and Etymology of theta

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


First Known Use: 15th century


Seen and Heard

What made you want to look up theta? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a very small amount

Get Word of the Day daily email!