theta

noun

the·​ta ˈthā-tə 

 chiefly British  ˈthē-tə

1

: the 8th letter of the Greek alphabet see Alphabet Table

2

: theta rhythm

Word History

Etymology

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

First Known Use

15th century, in the meaning defined at sense 1

Phrases Containing theta

• theta rhythm

Kids Definition

theta

noun

the·​ta ˈthāt-ə 

ˈthēt-

: the eighth letter of the Greek alphabet

—Θ or θ