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Upon vs. Once — What's the Difference?

Upon vs. Once — What's the Difference?

Difference Between Upon and Once

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Upon

On
The leaves are scattered upon the grass. He put the book upon the table. Upon hearing the news, we all cheered.

Once

One time only
Once a day.

Upon

Physically above and in contact with.
Place the book upon the table.

Once

At one time in the past; formerly.

Upon

Physically directly supported by.
The crew set sail upon the sea.
She balanced upon one foot.
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Once

At any time; ever
Once known, his face is never forgotten.

Upon

Being followed by another so as to form a series.
Hours upon hours, years upon years, mile upon mile of desert

Once

By one degree of relationship
My first cousin once removed.

Upon

At (a prescribed point in time).
The contract was rendered void upon his death.

Once

A single occurrence; one time
Once will have to do. You can go just this once.

Upon

On.

Once

As soon as; if ever; when
Once he goes, we can clean up.

Upon

On; - used in all the senses of that word, with which it is interchangeable.
Our host upon his stirrups stood anon.
Thou shalt take of the blood that is upon the altar.
The Philistines be upon thee, Samson.
As I did stand my watch upon the hill.
He made a great difference between people that did rebel upon wantonness, and them that did rebel upon want.
This advantage we lost upon the invention of firearms.
Upon the whole, it will be necessary to avoid that perpetual repetition of the same epithets which we find in Homer.
He had abandoned the frontiers, retiring upon Glasgow.
Philip swore upon the Evangelists to abstain from aggression in my absence.

Once

Having been formerly; former
The once capital of the nation.

Once

(frequency) One and only one time.
I have only once eaten pizza.

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.

Once

At any time; ever.
If the facts once became known, we'd be in trouble.

Once

(obsolete) One day, someday.

Once

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

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.

Once

The ounce.

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.

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.

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.

Once

Belonging to some prior time;
Erstwhile friend
Our former glory
The once capital of the state
Her quondam lover

Once

On one occasion;
Once I ran into her

Once

As soon as;
Once we are home, we can rest

Once

At a previous time;
Once he loved her
Her erstwhile writing

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