All 3 Uses

mock
in
Beloved, by Toni Morrison
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Still, there was no mockery coming from his gaze.†
Part 1 *
The gravity of their shields, clashing, countered and mocked the floating heads touching.†
Part 1
Her authority in the pulpit, her dance in the Clearing, her powerful Call (she didn't deliver sermons or preach—insisting she was too ignorant for that—she called and the hearing heard)—all that had been mocked and rebuked by the bloodspill in her backyard.†
Part 2

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