pí.
pi (the name of the sixteenth letter of the Classical and Modern Greek alphabets and the seventeenth in Old Greek)
Meaning & usage
pi (the name of the sixteenth letter of the Classical and Modern Greek alphabets and the seventeenth in Old Greek)
pi (an irrational constant representing the ratio of the circumference of a circle to its diameter; approximately 3.1415926535897932; usually written π, where pi x diameter = circumference)
Where this word comes from
Borrowed from Ancient Greek πῖ (pî), used in mathematics to represent periphery.
a word used in the phrase með kurt og pí, meaningless on its own
Where this word comes from
The etymology of this word is not known.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.