theta

noun

the·​ta ˈthā-tə How to pronounce theta (audio)
 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

Time Traveler
The first known use of theta was in the 15th century

Phrases Containing theta

Dictionary Entries Near theta

the system

theta

the Tabernacle

See More Nearby Entries 

Cite this Entry

“Theta.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/theta. Accessed 26 Nov. 2024.

Copy Citation

Share

Kids Definition

theta

noun
the·​ta ˈthāt-ə How to pronounce theta (audio)
ˈthēt-
: the eighth letter of the Greek alphabet
—Θ or θ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Popular in Grammar & Usage

See All

How to Use Em Dashes (—), En Dashes (–) , and Hyphens (-)

Plural and Possessive Names: A Guide

The Difference Between 'i.e.' and 'e.g.'

Why is '-ed' sometimes pronounced at the end of a word?

What's the difference between 'fascism' and 'socialism'?
See All

Popular in Wordplay

See All

Terroir, Oenophile, & Magnum: Ten Words About Wine

8 Words for Lesser-Known Musical Instruments

10 Words from Taylor Swift Songs (Merriam's Version)

9 Superb Owl Words

15 Words That Used to Mean Something Different
See All

Games & Quizzes

See All
Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.
Quordle Can you solve 4 words at once?
Play Blossom: Solve today's spelling word game by finding as many words as you can using just 7 letters. Longer words score more points.
Blossom Word Game Pick the best words!
Play Missing Letter: a crossword with a twist. Each of the 25 puzzle words start with a different letter of the alphabet. Which letter is missing?
Missing Letter A daily crossword with a twist
little chihuahua dressing like a turkey for thanksgiving
Is That Gratitude or Attitude? A Thanksgiving Quiz Decide which words express gratitude and which gi...