Definition of equinoctial
1 : relating to an equinox or to a state or the time of equal day and night
2 : relating to the regions or climate on or near the equator
3 : relating to the time when the sun passes an equinoctial point
Read the Latest from M-W
1545
First Known Use of equinoctial
1545
1521
First Known Use of equinoctial
1521
Learn More about equinoctial
Seen and Heard
What made you want to look up equinoctial? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!