All 8 Uses

contrary
in
Great Expectations
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"Lord bless the boy!" exclaimed my sister, as if she didn't quite mean that but rather the contrary.†
p. 12.9 *
But she did not; on the contrary, she seemed to prefer my being ignorant.†
p. 99.9 *
If on the contrary you mean to say—" Here, to his great amazement, he was stopped by Joe's suddenly working round him with every demonstration of a fell pugilistic purpose.†
p. 150.2
I acquiesced, of course, knowing nothing to the contrary.†
p. 206.4
"On the contrary," said he, "I thank you, for though we are strictly in our private and personal capacity, still it may be mentioned that there are Newgate cobwebs about, and it brushes them away."†
p. 315.8
On the contrary, I saw him next moment, once more holding out both his hands to me.†
p. 335.9
On the contrary, it would have been better, for his preservation would then have naturally and tenderly addressed my heart.†
p. 343.5
I was aware that Mr. Wopsle had not succeeded in reviving the Drama, but, on the contrary, had rather partaken of its decline.†
p. 405.9

Definitions:

(1) (contrary as in: a contrary idea)
different (perhaps opposite or mutually exclusive)

In formal logic, contrary propositions or contrary arguments describe two things that cannot both be true. They might be described as mutually exclusive. For example, a pet cannot be both a cat and a dog. It doesn't need to be either, but if it is one, it cannot be the other. So the statement that a pet is a cat and the statement that the same pet is a dog, are contrary statements.
(2) (contrary as in: a contrary personality)
disagreeable -- typically in reference to someone's personality
(3) (contrary to as in: contrary to)
in opposition to

You could also think of this as meaning, despite, or in spite of, or in conflict with; but since a common meaning of contrary is opposite, you many find it easiest to think of contrary to as in opposition to.
(4) (on the contrary as in: on the contrary)
an expression used to intensify denial of an idea
(5) (to the contrary as in: to the contrary)
with an opposite or different effect; or something with an opposite or different effect
(6) (meaning too rare to warrant focus)