Cusp

If you are a cusp, you were born on the 21-23 day of any month, and your true astrological profile may overlap into the adjacent sign.

for example...

I was born in Virgo on the 22nd of September in the Age of Pisces. As of 2000 we are now in the Age of Aquarius, and for whatever obscure reason the crossover to Libra is now September 21. I am supposedly a Virgo but never identified. Since learning about this phenomenon I have always fancied myself a Libra.

I am not an astrology geek

Cusp (k?sp), n. [L. cuspis, -idis, point, pointed end.]

1. Arch.

A triangular protection from the intrados of an arch, or from an inner curve of tracery.

2. Astrol.

The beginning or first entrance of any house in the calculations of nativities, etc.

3. Astron

The point or horn of the crescent moon or other crescent-shaped luminary.

4. Math.

A multiple point of a curve at which two or more branches of the curve have a common tangent.

5. Anat.

A prominence or point, especially on the crown of a tooth.

6. Bot.

A sharp and rigid point.

© Webster 1913.

Cusp, v. t. [imp. & p.p. Cusped (k?spt); p.pr. & vb. n. Cusping.]

To furnish with a cusp or cusps.

© Webster 1913.