1. mid-September

noun. the middle part of September.

Rhymes with September Equinox

2. September

noun. the month following August and preceding October.

3. equinox

noun. ['ˈiːkwəˌnɑːks'] (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic.

4. equinox

noun. ['ˈiːkwəˌnɑːks'] either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length.