All 10 Uses of

mock
in
Frankenstein - 1831 version

During the whole of this wretched mockery of justice I suffered living torture.†
p. 83.1 *

mockery = something that is ridiculous

The cold stars shone in mockery, and the bare trees waved their branches above me; now and then the sweet voice of a bird burst forth amidst the universal stillness.†
p. 138.5

The labours I endured were no longer to be alleviated by the bright sun or gentle breezes of spring; all joy was but a mockery which insulted my desolate state and made me feel more painfully that I was not made for the enjoyment of pleasure.†
p. 143.8

It was necessary that I should return without delay to Geneva, there to watch over the lives of those I so fondly loved and to lie in wait for the murderer, that if any chance led me to the place of his concealment, or if he dared again to blast me by his presence, I might, with unfailing aim, put an end to the existence of the monstrous image which I had endued with the mockery of a soul still more monstrous.†
p. 187.5

When I recovered I found myself surrounded by the people of the inn; their countenances expressed a breathless terror, but the horror of others appeared only as a mockery, a shadow of the feelings that oppressed me.†
p. 199.7

It rang on my ears long and heavily; the mountains re-echoed it, and I felt as if all hell surrounded me with mockery and laughter.†
p. 206.7

They have acquired new and almost unlimited powers; they can command the thunders of heaven, mimic the earthquake, and even mock the invisible world with its own shadows.†
p. 49.4 *

Stars and clouds and winds, ye are all about to mock me; if ye really pity me, crush sensation and memory; let me become as nought; but if not, depart, depart, and leave me in darkness.†
p. 151.4

I know not by what chain of thought the idea presented itself, but it instantly darted into my mind that the murderer had come to mock at my misery and taunt me with the death of Clerval, as a new incitement for me to comply with his hellish desires.†
p. 184.8

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.