What is the Full Form of ON?

ON does not have any specific full form. It is used either as a word or as a grammatical preposition, noun or adverb.


The word is derived in old English on and from the Germanic origin; related to German an and Dutch aan, from the Indo-European root shared by Greek ana.

As a word :

The word “ON” is normally used in terms of Science along with a word such as a switch for example. Switch on the fan. The word basically means to change the state of an object from zero state to the positive state or change the state of an object to the working state from out of working state.

Grammatically :

As “ON” can be used as noun, preposition and adverb so it is discussed as under.

As a preposition :

As a preposition the word can be used for multiple purposes such as :

  • To show physical contact or support:
    • “on the table was a book.”
  • To show location:
    • “There’s a camp on island.”
  • To mark a point:
    • “scratch on his leg.”
  • For a mentioned thing:
    • “a book on grammer.”
  • A thing mentioned as source medium for transfer ir storage of information:
    • “write down your name on paper”.

As an Adverb:

As an adverb, the word can be used for multiple purposes such as:

  • To indicate an action:
    • “he burbled on”
  • To show functioning:
    • “he always keeps the fan on”

As a noun:

The word can be used itself as a noun as well as in a combination of words:

  • “on the leg side.” (used in cricket)
  • he was on side.” (in football terminology)

Full forms:

ON has some full forms which are not commonly used and most of them are used by only specific department: or specific cities :

  • Ontario (in official postal use for a Canadian province )
  • Old Norse
  • Overmyer Network (former US television network)
  • Operative note (it is the documentation of care relating to an operation or surgery)
  • ON Semiconductor (semiconductor manufacturing company)
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