one

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

Characterized by unity; undivided.

Of the same kind or quality.

Forming a single entity of two or more components.

Being a single member or element of a group, category, or kind.

Being a single thing in contrast with or relation to another or others of its kind.

Occurring or existing as something indefinite, as in time or position.

Occurring or existing as something particular but unspecified, as in time past.

Used as an intensive.