on
//ɒn//
Preposition
Physically in contact with and supported by the top or outer surface of something.
The book is on the table.
Located at or along the side of something.
There is a small shop on the corner.
Forming a distinctive or marked part of the surface of something.
There is a spot on your shirt.
Indicating the day or date when something takes place.
The meeting is on Monday.
Indicating the subject or topic of something.
She wrote a book on Japanese history.
Indicating membership or involvement in something.
She is on the team.
Indicating the means or method by which something is done.
I came here on foot.
Indicating a state or condition of being engaged in an activity.
She is on duty tonight.
Adverb
Physically in contact with and supported by a surface.
Make sure the lid is on properly.
Indicating continuation of a movement or action.
They walked on through the forest.
In operation or functioning.
Is the air conditioner on?
Taking place or being presented.
What's on at the cinema tonight?
Antonym
Adjective
In operation or functioning (of electrical devices or systems).
Is the TV on?
Taking place or scheduled to take place.
Is the meeting still on?
Performing or appearing in a show or broadcast.
You're on in five minutes.