Word:   
Definitions of equinox:
  • noun:   either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length
  • noun:   (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic

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See equinox used in context: 6 rhymes, 1 Shakespeare work, several books and articles.

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