æquinox

A form of equinox — One of two times in the year (one in March and the other in September) when the length of the day and the night are equal, which occurs when the sun is directly overhead at the equator; this marks the beginning of spring in one hemisphere and autumn in the other.

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Meanings

nounæquinox (plural æquinoxes or æquinoctes)

plural æquinoxes · plural æquinoctes

  1. obsoleteObsolete spelling of equinox.

    [T]he Months of March and September, the tvvo Æquinoxes of Our year, are the moſt vvindy and tempeſtuous, the moſt unſettled and unequable of Seaſons in moſt Countries of the VVorld.

    1692 December 15, Richard Bentley, A Confutation of Atheism from the Origin and Frame of the World. The Third and Last Part. […], London: […] H[enry] Mortlock […], published 1693, →OCLC, pages 25–26
    1 more example

    For [Julius] Cæsar says, that on the night of the fourth day after his landing there was a full moon. He had before mentioned that the summer was far spent, and the æquinox not come, hence, the full moon must have been either in July or August.

    1854, John Williams, “Pro-consul. b.c. 55.”, in The Life of Julius Cæsar, London; New York, N.Y.: G[eorge] Routledge & Co., […], →OCLC, page 195
Cite this entry
APA

æquinox. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/%C3%A6quinox

MLA

“æquinox.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/%C3%A6quinox. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “æquinox,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/%C3%A6quinox.

Source: æquinox on Wiktionary, CC BY-SA 4.0.