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The Collaborative International Dictionary
Can't

Can't \Can't\ A colloquial contraction for can not.

Douglas Harper's Etymology Dictionary
can't

1706, contraction of cannot.

Wiktionary
can't

contraction 1 cannot; is unable to; does not have the ability to 2 is forbidden to; is not permitted to 3 Logically impossible. Logical negative conclusion. (Often with "be")

Usage examples of "can't".

If you can't reach Project Gutenberg, you can always email directly to: Michael S.

If you can't reach Project Gutenberg, you can always email directly to: Michael S.