only

only is an   Adverb

Definition:

[1] One alone; single; as, the only man present; his only occupation.

[2] Alone in its class; by itself; not associated with others of the same class or kind; as, an only child.

[3] Hence, figuratively: Alone, by reason of superiority; preëminent; chief. "Motley`s the only wear." Shak.

Synonyms: