haven't
HAV-uhnt/ˈhæv.n̩t/
- 1Contraction of "have not," used to negate the verb have, most often as the auxiliary in present perfect statements.
They haven't replied to my email since last week.
I haven't decided whether to take the job offer.
Note
Built from have plus the -n't ending, it can do more than negate the perfect. It can negate have as a full verb, with no help from do: Plautus's Amphitryon in its 1694 English version has "I haven't the conveniency," and "Haven't I to be here at 9?" inverts have to directly, where the do-pattern gives don't have and don't I have to. It also ends tag questions: "You've a bad back again, haven't you?"
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Origin
Formed from "have" combined with the contraction "-n't", meaning "not".