Used other than figuratively or idiomatically: see in, one's, head. / (idiomatic, of information, a plan, etc.) Within one's intellect, memory, or mind.

Synonym of in one's time

plural of no one's fool

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.

(impersonal pronoun, indefinite) One thing (among a group of others); one member of a group.

To cause to become one; to gather into a single whole; to unite.

The number represented by the Arabic numeral 1; the numerical value equal to that cardinal number. / (number theory) The first positive number in the set of natural numbers.

Used in contrast to anyone, someone or everyone: not one person; nobody.

Of a period of time, being particular. / Being a single, unspecified thing; a; any. / Sole, only. / Whole, entire. / In agreement. / The same. / Being a preeminent example.

Obsolete spelling of only