On

Pronunciation: /ˈɑːn/

On (preposition)

  1. In contact with a surface, with support from it.
  2. Fixed or placed so that it stays in a particular position.
  3. Working or operating; not off.

Examples

  • The cat is sitting on the table.
  • Please put the book on the shelf.

On (adverb)

  1. In the state of being operating or producing power.

Examples

  • Please make sure the computer is on.
  • The heater is on, so it feels warmer now.