theta

[ they-tuh, thee- ]

noun

1. the eighth letter of the Greek alphabet (Θ, θ).
2. the consonant sound represented by this letter.

theta

/ ˈθiːtə /

noun

1. the eighth letter of the Greek alphabet (Θ, θ), a consonant, transliterated as th
2. See edh
   the lower-case form of this letter used in phonetic transcription to represent the voiceless dental fricative th as in thick, both Compare edh

Word History and Origins

Origin of theta¹

1595–1605; < Greek thêta < Semitic See teth

Word History and Origins

Origin of theta¹

C17: from Greek, of Semitic origin; compare Hebrew tēth

Example Sentences

Horses that roamed with their herd, grazing outdoors at will, had more theta brainwaves.

From Science News For Students

Theta waves, in contrast, correlate with daydreaming—a sort of mental relaxation.

From Singularity Hub 

We can see this with decreased theta brain waves in the hippocampus, which is necessary to retrieve memories, the authors explained.

From Singularity Hub 

The region then further smothers theta waves in the hippocampus in an effort to stop intrusive thoughts.

From Singularity Hub 

Theta waves, which wash over the hippocampus, trigger a state in the brain that’s prone to a flow of ideas—à la “shower thoughts.”

From Singularity Hub 

As vice president of Theta, I was tasked with figuring out how to get members more involved.

From The Daily Beast

In Scientology parlance, good news is theta news; entheta is the opposite.

From The Daily Beast

The Gothic alphabet, in fact, as used in this country, had a Theta for expressing in one letter our present t and h conjoined.

From Project Gutenberg

The Theta Gammas wrote her down as material for a quaint little, quiet little dig,—not of sorority interest.

From Project Gutenberg

We'll go back to 29, and put in sine squared theta minus one equal to z sub four.

From Project Gutenberg

In order to make any solution at all possible you have assumed cosine squared theta negligible.

From Project Gutenberg

He maintained, however, that he had noticed Theta Cancri as well as the two planets, but without recording its position.

From Project Gutenberg