All 5 Uses of

mock
in
The Iceman Cometh

(a half-drunken mockery in his eyes) It'll be a great day for them, tomorrow—the Feast of All Fools, with brass bands playing†
Act 1

mockery = something that is ridiculous

PARRITT—(smiles almost mockingly) Oh, sure, I see.†
Act 1 *

mockingly = in a manner intended to make fun of

LARRY—(leans toward him, a comical intensity in his low voice) Don't mock the faith!†
Act 1 *

He leans toward them, drunk now from the effect of the huge drink he took, and speaks with a mocking suavity.†
Act 1

Definitions:

(1) (mock as in: don't mock me)
make fun of (ridicule--sometimes by imitating in an exaggerated manner)

or (more rarely): just to make fun or to be ridiculous without targeting anyone as a victim

These senses of mockery come together when a comedian pokes fun at a politician by pretending to be the politician and saying ridiculous things.
(2) (mock as in: a mock trial)
not real
(3) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Less commonly, mock can refer to a way of preparing food. Mockers can be an abbreviation for mockingbirds.