Equinoctial Definition

ēkwə-nŏkshəl, ĕkwə-
adjective
Relating to either of the equinoxes or to equal periods of day and night.
Webster's New World
Occurring at or about the time of an equinox.
Webster's New World
Relating to the celestial equator.
American Heritage Science
Equatorial.
Webster's New World
noun
Webster's New World
A storm occurring at or about the time of an equinox.
Webster's New World

(rare) The terrestrial equator.

Wiktionary
Synonyms:

Other Word Forms of Equinoctial

Noun

Singular:
equinoctial
Plural:
equinoctials

Origin of Equinoctial

  • Middle English equinoxial from Old French from Latin aequinoctiālis from aequinoctium equinox equinox

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin aequinoctiālis.

    From Wiktionary

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equinoctial