The word “cusp” has several meanings in English:
1. **Geometry and Mathematics**: A cusp refers to a pointed end or a sharp point where two curves meet. For example, it can describe a point on a curve where it changes direction.
2. **Astronomy and Astrology**: In astronomy, a cusp can refer to the phase of a celestial body that is transitioning from one phase to another, such as the phase of the moon when it is just before or after a full or new moon. In astrology, it may refer to the boundary between two astrological signs.
3. **General Use**: More broadly, the term can describe a point of transition or a turning point, particularly in a process or an experience.
4. **Dentistry**: In dental terms, a cusp refers to the pointed or rounded projections on the chewing surfaces of teeth.
Overall, “cusp” conveys the idea of a critical point or edge where changes occur.
