The digit or figure 1. / (mathematics) The neutral element with respect to multiplication in a ring. / (US) A one-dollar bill. / One o'clock, either a.m. or p.m.

a ketone / any similar compound containing a carbonyl functional group

(Singapore, Philippines, Malaysia, transitive, colloquial); Third-person singular simple present indicative form of on

(uncountable) State of being one or undivided; unity. / (countable) The product of being one or undivided.

plural of one / (sports) A senior or first team (as opposed to a reserves team). / (UK, prison slang) The cells located on the ground floor.

Not any person or thing whatsoever.

(colloquial) A particularly special or compatible person or thing. / (colloquial) A particular person destined to save the universe or world; the chosen one.

The person or thing.

A specified object, thing or person (especially one nearby or known).

A specified object, thing or person (especially one further away/over there or known or mentioned later).