won't
- 1Contraction of "will not," used to indicate that some future action or event is not going to occur.
The repairs won't be finished before the weekend.
She won't sign the contract until her lawyer reviews it.
Note
The spelling looks irregular because it preserves an old form of will: Middle English had wol and woll beside wil, and wol not wore down through wonnot to won't. In use it does more than predict. "Mom won't have the house turned into a hostel" expresses refusal, while a tag like "Come in, won't you?" turns a command into a warm invitation.
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Origin
This developed from an earlier form "wonnot," itself from Middle English "wynnot," "wilnot," and similar forms: all contractions of Middle English "will not," equivalent to "will" plus "not" (and/or "woll" plus "not").