Difference between On and Upon

Key difference: The term ‘upon’ is more formal than the term ‘on’. Although they both convey the same meaning, their difference is based on the context in which they are used.

Prepositions are used to build a sentence; it helps to link a noun, pronoun, or noun phrase to the other part of the sentence. There is no definite rule or formula for choosing a preposition. A preposition is used to show direction, location, or time, or to introduce an object.

A few examples for the term ‘on’ would be:

  • He is never on time. (It indicates a given time and place)
  • The drinks are on him. (It indicates cost)

A few examples for the term ‘upon’ would be:

  • He sat upon the horse. (It indicates someone or something in elevated position)
  • He smiled upon seeing his mother. (It indicates action and contact with)

Prepositions are words that are placed near pronouns, verbs, etc. in a sentence. They construct and help modify the meaning of the object in the sentence. The terms ‘on’ and ‘upon’ are both prepositions which indicate time and place. However, both the pronouns are frequently interchanged because their usage and purpose in the sentence is almost entirely the same. For example:

  • She relies on her sister for help.
  • She relies upon her sister for help.

In the above sentences, one can use either ‘on’ or ‘upon’, both the sentences will have the same meaning.

However, there are certain contexts where the term ‘on’ cannot be substituted for ‘upon’. For example:

  • Once upon a time, there lived a beautiful princess.
  • Christmas is upon us, and I need to buy gifts.

Here, in the above sentence, the preposition ‘upon’ is more suitable than the term ‘on’. These examples show that the given preposition is indicating an event and time. Also, ‘upon’ is considered an elevated word. It is simpler, general and more common in casual in American speech. In poetic or legal contexts, ‘upon’ is common used.

At times, the choice between ‘on’ and ‘upon’ is not merely a matter of style. Their usage in a sentence may entirely mean two different things. For example:

  • We study the influence of anion size on localization

In the above sentence, the term ‘on’ indicates that an investigation on localization is affected by anion size.

  • We study the influence of anion size upon localization

Here, the term ‘upon’ may indicate that an investigation will be affected by anion size, once localization has occurred.

From the above examples, it is worth noting that the difference between the two prepositions is based on their usage, readability, common use and the different meaning of a sentence. 

Comparison between On and Upon:

 

On

Upon

Definition

It is used to construct and help modify the meaning of the object in the sentence.

It is used to construct and help modify the meaning of the object in the sentence.

Formality

It is not formal.

It makes a sentence more formal.

Literature

It is mostly not used in literature and poetry.

It is more commonly used in literature and poetry.

Characteristic

It is easier and direct to use in a sentence.

It is used to emphasize on the meaning.

Indication

Location, time, to introduce an object.

Location, time, to introduce an object.

Example

The paper is on my desk.

Rains will be upon us in a week’s time.

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Comments

The differences are very well elaborated and are really helpful. Thanks.

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