to make the form, nature, content, future course, etc., of (something) different from what it is or from what it would be if left alone

to change one's name; to change one's opinion; to change the course of history.

to transform or convert (usually fol. by into )

The witch changed the prince into a toad.

to substitute another or others for; exchange for something else, usually of the same kind

She changed her shoes when she got home from the office.

to give and take reciprocally; interchange

to change places with someone.

to transfer from one (conveyance) to another

You'll have to change planes in Chicago.

to give or get smaller money in exchange for

to change a five-dollar bill.

to give or get foreign money in exchange for

to change dollars into francs.

to remove and replace the covering or coverings of

to change a bed; to change a baby.

to become different

Overnight the nation's mood changed.

to become altered or modified

Colors change if they are exposed to the sun.

to become transformed or converted (usually fol. by into )

The toad changed into a prince again.

to pass gradually into (usually fol. by to or into )

Summer changed to autumn.

to make a change or an exchange

If you want to sit next to the window, I'll change with you.

to transfer between trains or other conveyances

We can take the local and change to an express at the next stop.

to change one's clothes

She changed into jeans.

(of the moon) to pass from one phase to another.

(of the voice) to become deeper in tone; come to have a lower register

The boy's voice began to change when he was thirteen.

the act or fact of changing; fact of being changed.

a transformation or modification; alteration

They noticed the change in his facial expression.

a variation or deviation

a change in the daily routine.

the substitution of one thing for another

We finally made the change to an oil-burning furnace.

variety or novelty

Let's try a new restaurant for a change.

the passing from one place, state, form, or phase to another

a change of seasons; social change.

Jazz . harmonic progression from one tonality to another; modulation.

the supplanting of one thing by another.

anything that is or may be substituted for another.

a fresh set of clothing.

money given in exchange for an equivalent of higher denomination.

a balance of money that is returned when the sum tendered in payment is larger than the sum due.

coins of low denomination.

any of the various sequences in which a peal of bells may be rung.

Also, 'change. British . exchange ( def. 10 ) .

Obsolete . changefulness; caprice. ?

change off,

to take turns with another, as at doing a task.

to alternate between two tasks or between a task and a rest break. ?

change front

Military . to shift a military force in another direction.

change hands. hand ( def. 47 ) .

change one's mind

to change one's opinions or intentions.

ring the changes

to perform all permutations possible in ringing a set of tuned bells, as in a bell tower of a church.

to vary the manner of performing an action or of discussing a subject; repeat with variations.

adjective

stable , fixed , unchanging

adjective

changeable , mobile , dynamic , alternating , modifying , unstable , inconstant , uncertain , unsteady , irresolute , wavering , altering , developing , growing