O OneWordDaily
AI-generated image
Word of the Day Tuesday, June 9, 2026

tau

/tɔː/ noun · British & US
Valid in UKValid in US
Share WhatsApp

What does tau mean?

noun

The 19th letter of the Greek alphabet, used in mathematics to represent a mathematical constant approximately equal to 6.283185.

Example

"The tau symbol is often used in mathematical equations to represent the ratio of a circle's circumference to its diameter."

Definition generated by AI and curated by RJS Tech Solutions LLP.

Synonyms for tau

Rhymes with tau

Etymologically related