september equinox(n = noun.time) autumnal equinox, fall equinox - September 22;
is a kind of equinox
is a part of sep, sept, september, autumn, fall

autumnal equinox, black september, black september movement, equinox, fall equinox, march equinox, september, september 11, september 17, september 29, september elm, spring equinox, vernal equinox