[ee-kwuh-nok-shuhl, ek-wuh-]
pertaining to an equinox or the equinoxes, or to the equality of day and night.
pertaining to the celestial equator.
occurring at or about the time of an equinox.
Botany. (of a flower) opening regularly at a certain hour.

1350–1400; Middle English < Latin aequinoctiālis pertaining to the equinox. See equinox, -al1

interequinoctial, adjective
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World English Dictionary
equinoctial (ˌiːkwɪˈnɒkʃəl)
1.  relating to or occurring at either or both equinoxes
2.  (of a plant) having flowers that open and close at specific regular times
3.  astronomy of or relating to the celestial equator
4.  a storm or gale at or near an equinox
5.  another name for celestial equator
[C14: from Latin aequinoctiālis concerning the equinox]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
equinoctial   (ē'kwə-nŏk'shəl, ěk'wə-)  Pronunciation Key 
  1. Relating to an equinox.

  2. Relating to the celestial equator.

Noun   See celestial equator.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
And in truth the sun has extreme power here, since it is within twenty-six degrees of the equinoctial line.
The occurrence of the spill within the equinoctial spring tides allowed waves to reach five meters higher than normal tides.
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