Au-tüm'nal, a.
a. [Lat. auctumnalis, autumnalis, Fr. & Pr. automnal.]
Sense 1. Belonging, or peculiar, to autumn; as, an autumnal tint; produced or gathered in autumn; as, autumnal fruits; flowering in autumn; as, an autumnal plant.
Thick as autumnal leaves that strow the brooks In Vallombrosa. Milton.
Sense 2. Past the middle of life; in the third stage. “An autumnal matron.” Hawthorne.
Autumnal equinox, the time when the sun crosses the equator, as it proceeds southward, or when it passes the autumnal point. — Autumnal point, the point of the equator intersected by the ecliptic, as the sun proceeds southward; the first point of Libra. — Autumnal signs, the signs Libra, Scorpio, and Sagittarius, through which the sun passes between the autumnal equinox and winter solstice.