on

1. To switch on

   Can you on the light?

1. In the state of being active, functioning or operating.

   All the lights are on, so they must be home.

2. Performing according to schedule; taking place.

   Are we still on for tonight?

3. Fitted; covering; being worn.

   I was trying to drink out of the bottle while the top was still on!

4. (usually negative) Acceptable, appropriate.

   You can't do that; it's just not on.

5. Destined, normally in the context of a challenge being accepted; involved, doomed.

   "Five bucks says the Cavs win tonight." ―"You're on!"

6. Having reached a base as a runner and being positioned there, awaiting further action from a subsequent batter.
7. Within the half of the field on the same side as the batsman's legs; the left side for a right-handed batsman.

   Ponsonby-Smythe hit a thumping on drive.

8. Menstruating.

1. To an operating state.

   turn the television on

2. So as to cover or be fitted.

   Put on your hat and gloves.

3. Along, forwards (continuing an action).

   drive on, rock on

4. In continuation, at length.

   He rambled on and on.

5. (obsolete in the US) Later.

   Ten years on, nothing had changed in the village.

6. Of betting odds, denoting a better-than-even chance. See also odds-on.

   That horse is twenty-to-one on, so you need to stake twenty pounds just to win one pound.

1. Positioned at the upper surface of, touching from above.

   A vase of flowers stood on the table.

2. Positioned at or resting against the outer surface of; attached to.

   He had a scar on the side of his face.

3. Expressing figurative placement or attachment.

   All of the responsibility is on him.

4. Denoting performance or action by contact with the surface, upper part, or outside of anything; hence, by means of; with.

   to play on a violin or piano

5. At or in (a certain region or location).

   The lighthouse that you can see is on the mainland.

6. Near; adjacent to; alongside.

   Croton-on-Hudson, Rostov-on-Don, Southend-on-Sea

7. Supported by (the specified part of itself).

   A table can't stand on two legs.

8. So as to impart force to.

   tug on the rope; push hard on the door

9. So as to impact; against.

   I stubbed my toe on an old tree stump.

10. Covering.

    He wore old shoes on his feet.

11. (with certain modes of transport, especially public transport) Inside (a vehicle) for the purpose of travelling.

    on a bus, on a train, on a plane

12. At the date of.

    Born on the 4th of July.

13. Some time during the day of.

    Can I see you on a different day?

14. At a given time after the start of something; at.

    Smith scored again on twelve minutes, doubling Mudchester Rovers' lead.

15. Dealing with the subject of; about; concerning.

    I have no opinion on this subject.

16. In the possession of.

    I haven't got any money on me.

17. Because of, or due to.

    to arrest someone on suspicion of bribery

18. Upon; at the time of (and often because of).

    On Jack's entry, William got up to leave.

19. Paid for by.

    I paid for the airfare and meals for my family, but the hotel room was on the company.

20. Indicating a means or medium.

    Can't you see I'm on the phone?

21. Indicating the target of, or thing affected by, an event or action.

    Her words made a lasting impression on my mind.

22. Toward; for; indicating the object of an emotion.

    Have pity or compassion on him.

23. Indicating a means of subsistence.

    The dog survived three weeks on rainwater.

24. Away or occupied with (e.g. a scheduled activity).

    He's on his lunch break.

25. Regularly taking (a drug).

    He's acting so strangely, I think he must be on something.

26. Under the influence of (a drug).

    He's acting crazy because he's on crack right now.

27. Having identical domain and codomain.

    a function on

28. Having V^n as domain and V as codomain, for some set V and integer n.

    an operator on

29. Generated by.

    the free group on four letters

30. In addition to; besides; indicating multiplication or succession in a series.

    heaps on heaps of food

31. Of
32. Indicating dependence or reliance; with confidence in.

    He will promise on certain conditions.

33. At the peril of, or for the safety of.
34. In the service of; connected with; of the number of.

    He is on a newspaper; I am on the committee.

35. By virtue of; with the pledge of.

    He affirmed or promised on his word, or on his honour.

36. To the account or detriment of; denoting imprecation or invocation, or coming to, falling, or resting upon.

    A curse on him!

37. (especially when numbers of combatants or competitors are specified) Against; in opposition to.

    The fight was three on one, and he never stood a chance.

preposition

Without.

1. In the Japanese language, a pronunciation, or reading, of a kanji character that was originally based on the character's pronunciation in Chinese, contrasted with kun.

   Most kanji have two kinds of reading, called "on" and "kun".