on

Definitions of on in various dictionaries:

adj - in operation or operational

adj - (of events) planned or scheduled

adv - with a forward motion

adv - indicates continuity or persistence or concentration

adv - in a state required for something to function or be effective

Used to indicate position above and supported by or in contact with: The vase is on the table.

Used to indicate contact with or extent over (a surface) regardless of position: a picture on the wall; a rash on my back.

Used to indicate location at or along: the pasture on the south side of the river; a house on the highway.

Used to indicate proximity: a town on the border.

Used to indicate attachment to or suspension from: beads on a string.

Used to indicate figurative or abstract position: on the young side, but experienced; on her third beer; stopped on chapter two.

Used to indicate actual motion toward, against, or onto: jumped on the table; the march on Washington.

Used to indicate figurative or abstract motion toward, against, or onto: going on six o’clock; came on the answer by accident.

Used to indicate occurrence at a given time: on July third; every hour on the hour.

Used to indicate the particular occasion or circumstance: On entering the room, she saw him.

Used to indicate the object affected by actual, perceptible action: The spotlight fell on the actress.

Used to indicate the object affected by a figurative action: Have pity on them.

Used to indicate the object of an action directed, tending, or moving against it: an attack on the fortress.

Used to indicate the object of perception or thought: gazed on the vista; meditated on his actions.

Used to indicate the agent or agency of a specified action: cut his foot on the broken glass; talked on the telephone.

Used to indicate a medicine or other corrective taken or undertaken routinely: went on a strict diet.

Used to indicate a substance that is the cause of an addiction, a habit, or an altered state of consciousness: high on dope.

Used to indicate a source or basis: “We will reach our judgments not on intentions or on promises but on deeds and on results” (Margaret Thatcher).

Used to indicate the state or process of: on leave; on fire; on the way.

Used to indicate the purpose of: travel on business.

Used to indicate a means of conveyance: ride on a train.

Used to indicate availability by means of: beer on tap; a physician on call.

Used to indicate belonging to: a nurse on the hospital staff.

Used to indicate addition or repetition: heaped error on error.

Concerning; about: a book on astronomy.

Concerning and to the disadvantage of: We have some evidence on him.

In one’s possession; with: I haven’t a cent on me.

At the expense of; compliments of: drinks on the house.

In or into a position or condition of being supported by or in contact with something: Put the coffee on.

In or into a position of being attached to or covering something: Put your clothes on.

In the direction of something: He looked on while the ship docked.

Toward or at a point lying ahead in space or time; forward: The play moved on to the next city.

At or to a more distant point in time or space: I’ll do it later on.

In a continuous course: He worked on quietly.

In or into performance or operation: Turn on the radio.

In progress or action; in a state of activity: The show must go on.

In or at the present position or condition: stay on; hang on.

In a condition of being scheduled for or decided upon: There is a party on tonight.

Being in operation: The television is on.

Under or behaving as if under observation: A minister is always on.

Functioning or performing at a high degree of competence or energy: The goalie is really on.

Planned; intended: Our calendar is open; we have nothing on for this weekend.

To be aware of or have information about: You’ll never deceive us again; we’re on to you.

noun - the side of the wicket where a batsman stands in cricket