preposition

on

Translation

on, about, concerning

The book is on the table.

Please turn the light on.

We have a meeting on Monday.

She wrote a book on history.

((on sth.)) indicating position on a surface The keys are on the desk.

((on <a day>)) indicating a specific day The party is on Saturday.

((on <a topic>)) indicating the subject matter He gave a speech on climate change.

((turn sth. on)) to activate something Can you turn the TV on?

Synonyms: upon, atop (for position); Antonyms: off (for state)

From Old English 'on', related to German 'an'.

Picture an object physically resting 'on' a surface. For the active state, think of a switch being flipped to the 'ON' position.