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On is used to show position. (preposition)

An example of on is a book resting on top of a table.

On means in action or performing a function. (adjective)

An example of on is a lamp giving off light.

See on in Webster's New World College Dictionary

in a position above, but in contact with and supported by; upon
in contact with (any surface); covering or attached to
so as to be supported by: leaning on his elbow
in the surface of: a scar on the body
1. near to; by: a cottage on the lake, seated on my right
2. having as its location: a house on Main Street
3. assigned to work at or in: on the maternity ward, on the switchboard
at or during the time of: on entering, on the first day
having a basis of or having its ground in (something specified): based on her diary, on purpose
connected with as a part or member: on the faculty
engaged in: on a trip
in the state or condition of: on parole, on fire
in a (specified) manner: chiefly archaic except in phrases with the: on the sly
as a result of: a profit on the sale
in the direction or vicinity of: light shone on us
so as to affect: to put a curse on someone
regularly following (a regimen), ingesting (medicine), etc., as to promote good health: on a diet, on penicillin
1. through the means or use of: to live on bread, running on diesel fuel
2. through the medium of: on the phone, to act on TV
3. using for transportation: on a train
with regard to; concerning: an essay on war
coming after: used to indicate repetition: we suffered insult on insult
placing obligation or responsibility with: rely on me; the onus is on him
onto: just throw it on the porch
☆ chargeable to; at the expense of: have a drink on the house; lunch is on me
in jazz, popular music, etc.,
1. playing: Jim is on guitar
2. in (): he played on the Basie band
☆ Informal habitually using; addicted to: to be on drugs
Informal carried by: I have no money on me
Informal constantly nagging at, finding fault with, etc.: the boss has been on him all day
1. Dialectal of, at, about, for, in
2. Brit. in (, , )
3. Chiefly Northeast in (): waiting on line at the bank

adverb

in or into a situation or position of contacting, being supported by, or covering: put your shoes on
in a direction to or toward: he looked on
1. in advance; forward; ahead: move on
2. Brit. along in time; later; after: thirty years on, nothing had changed
lastingly; continuously: she sang on
into operation, performance, or action: switch on the light
Baseball on base
Theater on stage

adjective

in action, operation, or occurrence: the TV is on
near or nearer
arranged or planned for: tomorrow's game is still on
Slang performing or functioning at a high level of competence: he was really on in last night's game
Cricket designating that side of the field, or of the wicket, where the batsman stands

noun

the fact or state of being on
Cricket the on side

Bible Heliopolis

Old Norse
Ontario

See on in American Heritage Dictionary 4

(ŏn, ôn)

preposition

a. Used to indicate position above and supported by or in contact with: The vase is on the table. We rested on our hands and knees.
b. Used to indicate contact with or extent over (a surface) regardless of position: a picture on the wall; a rash on my back.
c. Used to indicate location at or along: the pasture on the south side of the river; a house on the highway.
d. Used to indicate proximity: a town on the border.
e. Used to indicate attachment to or suspension from: beads on a string.
f. Used to indicate figurative or abstract position: on the young side, but experienced; on her third beer; stopped on chapter two.
a. Used to indicate actual motion toward, against, or onto: jumped on the table; the march on Washington.
b. Used to indicate figurative or abstract motion toward, against, or onto: going on six o'clock; came on the answer by accident.
a. Used to indicate occurrence at a given time: on July third; every hour on the hour.
b. Used to indicate the particular occasion or circumstance: On entering the room, she saw him.
a. Used to indicate the object affected by actual, perceptible action: The spotlight fell on the actress. He knocked on the door.
b. Used to indicate the object affected by a figurative action: Have pity on them.
c. Used to indicate the object of an action directed, tending, or moving against it: an attack on the fortress.
d. 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.
a. Used to indicate a medicine or other corrective taken or undertaken routinely: went on a strict diet.
b. Used to indicate a substance that is the cause of an addiction, a habit, or an altered state of consciousness: high on dope.
a. 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).
b. Used to indicate a source of power or energy: The car runs on methane.
a. Used to indicate the state or process of: on leave; on fire; on the way.
b. Used to indicate the purpose of: travel on business.
c. Used to indicate a means of conveyance: ride on a train.
d. 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.
a. Concerning; about: a book on astronomy.
b. Concerning and to the disadvantage of: We have some evidence on him.
Informal In one's possession; with: I haven't a cent on me.
At the expense of; compliments of: drinks on the house.

adverb

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.
a. Toward or at a point lying ahead in space or time; forward: The play moved on to the next city.
b. 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.
a. In or into performance or operation: Turn on the radio.
b. 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.

adjective

Being in operation: The television is on.
a. Engaged in a given function or activity, such as a vocal or dramatic role: You're on in five minutes!
b. Under or behaving as if under observation: A minister is always on.
Informal Functioning or performing at a high degree of competence or energy: The goalie is really on.
a. Planned; intended: We have nothing much on for this weekend.
b. Happening; taking place: The parade is on.
Baseball Having reached base safely; on base: Two runners are on.

Usage Note: To indicate motion toward a position, both on and onto can be used: The cat jumped on the table. The cat jumped onto the table. Onto is more specific, however, in indicating that the motion was initiated from an outside point. He wandered onto the battlefield means that he began his wandering at some point off the battlefield. He wandered on the battlefield may mean that his wandering began on the battlefield. • In constructions where on is an adverb attached to a verb, it should not be joined with to to form the single word onto: move on to (not onto) new subjects; hold on to (not onto) our gains. • In their uses to indicate spatial relations, on and upon are often interchangeable: It was resting on (or upon) two supports. We saw a finch light on (or upon) a bough. To indicate a relation between two things, however, instead of between an action and an end point, upon cannot always be used: Hand me the book on (not upon) the table. It was the only town on (not upon) the main line. Similarly, upon cannot always be used in place of on when the relation is not spatial: He wrote a book on (not upon) alchemy. She will be here on (not upon) Tuesday.

abbreviation