Once vs. Ones: What's the Difference?

Once and Ones Definitions
Once
One time only
Once a day.
Ones
Being a single entity, unit, object, or living being
I ate one peach.
Once
At one time in the past; formerly.
Ones
Characterized by unity; undivided
They spoke with one voice.
Once
At any time; ever
Once known, his face is never forgotten.
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Ones
Of the same kind or quality
Two animals of one species.
Once
By one degree of relationship
My first cousin once removed.
Ones
Forming a single entity of two or more components
Three chemicals combining into one solution.
Once
A single occurrence; one time
Once will have to do. You can go just this once.
Ones
Being a single member or element of a group, category, or kind
I'm just one player on the team.
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Once
As soon as; if ever; when
Once he goes, we can clean up.
Ones
Being a single thing in contrast with or relation to another or others of its kind
One day is just like the next.
Once
Having been formerly; former
The once capital of the nation.
Ones
Occurring or existing as something indefinite, as in time or position
He will come one day.
Once
(frequency) One and only one time.
I have only once eaten pizza.
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Ones
Occurring or existing as something particular but unspecified, as in time past
Late one evening.
Once
(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.
Ones
(Informal) Used as an intensive
That is one fine dog.
Once
At any time; ever.
If the facts once became known, we'd be in trouble.
Ones
Being the only individual of a specified or implied kind
The one person I could marry.
The one horse that can win this race.
Once
(obsolete) One day, someday.
Ones
The cardinal number, represented by the symbol 1, designating the first unit in a series.
Once
(mathematics) Multiplied by one: indicating that a number is multiplied by one.
Once three is three.
Ones
A single person or thing; a unit
This is the one I like best. Of her many books, the best ones are the last two.
Once
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.
Ones
A one-dollar bill.
Once
The ounce.
Ones
Plural of one
Once
For one time; by limitation to the number one; not twice nor any number of times more than one.
Ye shall . . . go round about the city once.
Trees that bear mast are fruitful but once in two years.
Ones
(sports) A senior or first team (as opposed to a reserves team).
Once
At some one period of time; - used indefinitely.
My soul had once some foolish fondness for thee.
That court which we shall once govern.
Ones
The cells located on the ground floor.
Once
At any one time; - often nearly equivalent to ever, if ever, or whenever; as, once kindled, it may not be quenched.
Wilt thou not be made clean? When shall it once be?
To be once in doubtIs once to be resolved.
Ones
Plural of one
Once
Belonging to some prior time;
Erstwhile friend
Our former glory
The once capital of the state
Her quondam lover
Ones
Obsolete form of one's
Once
On one occasion;
Once I ran into her
Ones
Once.
Once
As soon as;
Once we are home, we can rest
Once
At a previous time;
Once he loved her
Her erstwhile writing