one: meaning and definitions

Being a single entity, unit, object, or living being.

Characterized by unity; undivided: They spoke with one voice.

Of the same kind or quality: two animals of one species.

Forming a single entity of two or more components: three chemicals combining into one solution.

Being a single member or element of a group, category, or kind: I'm just one player on the team.

Being a single thing in contrast with or relation to another or others of its kind: One day is just like the next.

Occurring or existing as something indefinite, as in time or position: He will come one day.

Occurring or existing as something particular but unspecified, as in time past: late one evening.

Informal Used as an intensive: That is one fine dog.

Being the only individual of a specified or implied kind: the one person I could marry; the one horse that can win this race.

The cardinal number, represented by the symbol 1, designating the first such unit in a series.

A single person or thing; a unit: This is the one I like best.

A one-dollar bill.

An indefinitely specified individual: She visited one of her cousins.

An unspecified individual; anyone: "The older one grows the more one likes indecency” ( Virginia Woolf).

at one In accord or unity.

one and all Everyone.

one by one Individually in succession.