Definition Of on


(of an electrical appliance or power supply) functioning.

they always left the lights on

(of an entertainment or other event) taking place or being presented.

what's on at the festival

added to.

a few cents on the electric bill is nothing compared with your security

as a member of (a committee, jury, or other body).

they would be allowed to serve on committees

denoting molecular units.


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Example Of on

  • on sale

  • on your knees

  • a book on the Celts

  • After I began writing this article, a passionate debate on the same subject erupted in an online discussion forum.

  • An Australian film crew were making a documentary on Asian footballers who play in Europe.

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