01 a. Of, belonging to, or peculiar to, autumn; as, an autumnal tint; produced or gathered in autumn; as, autumnal fruits; flowering in autumn; a…
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1.
Of, belonging to, 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.
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2.
Past the middle of life; in the third stage.“An autumnal matron.” — Hawthorne.
Phrases & compounds
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.