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Definition of theta

theta

/ˈθeɪ.tə/
the · ta
Plural:thetas
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theta Lexical Profile

theta Game Scores & Validity

• noun

1

The eighth letter of the Greek alphabet (Θ, θ), transliterated as 'th' and commonly used in mathematics and physics as a symbol for an unknown angle or temperature.

Example

"In trigonometry, the Greek letter theta is frequently used to represent the measure of an unknown angle."

2

In quantitative finance, a measure of the rate of decline in the value of an option due to the passage of time, also known as time decay.

Example

"Options traders closely monitor theta because a contract loses value more rapidly as its expiration date approaches."

• Rhymes for theta

• Nearby Words

thespesia
thespian
thessaloniki
theta
thevetia
they
thi lo su

Word Origin & Etymology

Borrowed via Latin from the Ancient Greek letter θῆτα (thêta), which in turn derived from the Phoenician letter teth, meaning 'wheel'.

Cite this Entry

Wordmom. (2026). Definition of Theta. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/theta
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