Akademik

n't

adv. (in comb.) = NOT (usu. with is, are, have, must, and the auxiliary verbs can, do, should, would: isn't; mustn't) (see also CAN'T, DON'T, WON'T).
Etymology: contr.

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contraction of not, used with auxiliary verbs (e.g., can't, won't, didn't, and isn't)

Useful english dictionary. 2012.