vernal equinox

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ver·nal e·qui·nox • n. the equinox in spring, on about March 20 in the northern hemisphere and September 22 in the southern hemisphere. ∎ Astron. the equinox in March. Also called spring equinox. ∎  Astron. another term for First Point of Aries (see Aries).

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vernal equinox: see equinox.