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Word: cusp
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Meaning:
Noun:
- A sharp point or pointed end.
- astrology A boundary between signs and houses.
- dentistry Any of the pointed parts of a canine tooth or molar.
- figuratively An important moment when a decision is made that will determine future events.
- geometry A point of a curve where the curve is continuous but has no derivative, but such that it has a derivative at every nearby point.
Source: Wiktionary
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