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autumnal equinox Syllabification: au·tum·nal e·qui·nox

Definition of autumnal equinox in English:

noun

The equinox in autumn, on about September 22 in the northern hemisphere and March 20 in the southern hemisphere.
Example sentences
  • Sunlight is continuous throughout the summer, but after the solstice the sun slowly sinks to the horizon until it drops below on the autumn equinox.
  • The autumn equinox was 22nd September but I'll be celebrating it with friends and family today.
  • Make a portrait of the north woods in upper Minnesota over the ninety days between the autumn equinox and winter solstice.

Definition of autumnal equinox in:

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