o.
The fifteenth letter of the English alphabet, called o and written in the Latin script.
Meaning & usage
The fifteenth letter of the English alphabet, called o and written in the Latin script.
Alternative form of ο, the fifteenth letter of the Classical and Modern Greek alphabets, called omicron and (astronomy) used as an abbreviation of omicron in star names.
The system's Bayer designation is o Persei.
The fifteenth numeral symbol of the English alphabet, called o and written in the Latin script.
The name of the Latin script letter O/o.
A zero (used in reading out numbers).
It is currently two-o-five in the afternoon (2:05 PM).
The first permanent English settlement in America was in Jamestown in sixteen-o-seven (1607).
alternative form of O (vocative particle)
Alternative form of oh.
Operator
Object, see SVO
Clipping of over.
Alternative form of of.
Where this word comes from
See o'.
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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.