Once vs. Ones

Once vs. Ones — Is There a Difference?
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Difference Between Once and Ones

Onceadverb

(frequency) One and only one time.

I have only once eaten pizza.

Onesnoun

(sports) A senior or first team (as opposed to a reserves team).

Onceadverb

(temporal location) Formerly; during some period in the past.

He was once the most handsome man around.I once had a bicycle just like that one.

Onceadverb

(mathematics) Multiplied by one: indicating that a number is multiplied by one.

Once three is three.

Onceadverb

As soon as.

Onceadverb

(obsolete) At a future time.

If the facts once became known, we'd be in trouble.
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Onceconjunction

As soon as; when; after.

We'll get a move on once we find the damn car keys!Once you have obtained the elven bow, return to the troll bridge and trade it for the sleeping potion.Once he is married, he will be able to claim the inheritance.

Onceadjective

belonging to some prior time;

erstwhile friendour former glorythe once capital of the stateher quondam lover

Onceadverb

on one occasion;

once I ran into her

Onceadverb

as soon as;

once we are home, we can rest

Onceadverb

at a previous time;

once he loved herher erstwhile writing