something said or done to provoke laughter or cause amusement, as a witticism, a short and amusing anecdote, or a prankish act

He tells very funny jokes. She played a joke on him.

something that is amusing or ridiculous, esp. because of being ludicrously inadequate or a sham; a thing, situation, or person laughed at rather than taken seriously; farce

Their pretense of generosity is a joke. An officer with no ability to command is a joke.

a matter that need not be taken very seriously; trifling matter

The loss was no joke.

something that does not present the expected challenge; something very easy

The test was a joke for the whole class.

practical joke.

to speak or act in a playful or merry way

He was always joking with us.

to say something in fun or teasing rather than in earnest; be facetious

He didn't really mean it, he was only joking.

to subject to jokes; make fun of; tease.

to obtain by joking

The comedian joked coins from the audience.

adverb

facetiously , jocularly , in jest , in fun