on

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1 on /ˈɑːn/ preposition
1 on
/ˈɑːn/
preposition
Learner's definition of ON
: touching and being supported by the top surface of (something)
: to a position that is supported by (something)
used to indicate the part or object by which someone or something is supported
used to say that something is attached to something
used to indicate where someone or something is hit or touched
used to indicate the surface or part where something is seen or located
used to say that something (such as jewelry) is being worn by someone
: near or close to (something or someone)
used to indicate the location or position of something or someone
used to indicate the time when something happened or will happen
: immediately after (something)
used to indicate the subject of something
10 
used to indicate the device or instrument that is used to do something
used to say that someone is using a telephone, computer, etc.
used to describe the device, system, etc., that is used for seeing something, hearing something, etc.
11 
used to indicate a source of something (such as money, food, information, or energy)
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used to indicate the vehicle or animal by which someone or something is moved from one place to another
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used to say that you have something in your possession at a particular time
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used to indicate the state of something
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used to indicate an activity that someone did or is now doing
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used to indicate something (such as a medicine or drug) that a person or animal is using
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used to indicate the person or thing that is responsible for something
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used to indicate the person or thing that something is directed toward
used to say that someone has been affected by something
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used after an adjective to indicate the thing that a statement relates to
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: as stated or shown by (someone or something)
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used to indicate that someone or something is included as part of a team, list, etc.
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used to say that someone or something has an advantage
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chiefly US used to say that someone is playing or performing well

on about

British, informal + disapproving
: talking about

on at

British, informal
: asking (someone) for something repeatedly and in a way that is annoying
: asking or telling (someone) to do something repeatedly and in a way that is annoying

on it

: actively dealing with a problem, job, etc.
2 on /ˈɑːn/ adverb
2 on
/ˈɑːn/
adverb
Learner's definition of ON
used to indicate that something is attached to, covering, or supported by something else
used to describe something that is being worn by someone
used to indicate movement forward
used to indicate that an activity, event, or condition continues
: in an advanced state
: at a more advanced time : at a later time
: from one person or thing to another
used to indicate that something is operating, flowing, etc.
used to indicate that something is being heated, prepared, etc.
: in or into a train, bus, etc.

on and off

see 1off
3 on /ˈɑːn/ adjective
3 on
/ˈɑːn/
adjective
Learner's definition of ON
not used before a noun : attached to or covering something
not used before a noun : performing or speaking in public
not used before a noun : working at a job
not used before a noun : operating or flowing
: in a position that starts the flow of electricity, water, etc.
not used before a noun
: taking place or happening
: doing something as planned
not used before a noun : being broadcast on television or radio
not used before a noun, chiefly US used to say that you are able to do something well at a particular time

not on

British, informal
: not acceptable or proper
: not possible

you're on

informal
used to say that you accept a bet or challenge
Comments & Questions
Comments & Questions
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