theta
Americannoun
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the eighth letter of the Greek alphabet (Θ, θ).
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the consonant sound represented by this letter.
noun
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the eighth letter of the Greek alphabet (Θ, θ), a consonant, transliterated as th
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the lower-case form of this letter used in phonetic transcription to represent the voiceless dental fricative th as in thick, both Compare edh
Etymology
Origin of theta
1595–1605; < Greek thêta < Semitic See teth
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Then by 2½ minutes, slower-frequency theta waves related to deep inner stillness increased.
From The Wall Street Journal ● Jun. 27, 2026
Stroik and Ramsden's new research will contribute to ongoing basic studies in polymerases theta and delta, while also aiding new cancer drugs called polymerase theta inhibitors, which are currently in clinical trials.
From Science Daily ● Nov. 15, 2023
Polymerase theta acts quickly, grabbing the two single strands of DNA, matching up the closest base pairs to the break, and holding them together.
From Science Daily ● Nov. 15, 2023
The five common brain-wave types, named alpha, beta, gamma, delta and theta depending on their oscillation rate, signify different states of the brain.
From Scientific American ● Jun. 16, 2023
“These are the theta waves,” he told the audience.
From "A Deadly Wandering: A Mystery, a Landmark Investigation, and the Astonishing Science of Attention in the Digital Age" by Matt Richtel
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
