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Webster 1913 Edition

Adj.

Coming between the equinoxes.

Summer and winter I have called

interequinoctial

intervals.

F. Balfour.

Adj.

[inter and equinox.] Coming between the vernal and autumnal equinoxes.

Spring and autumn I have denominated equinoctial periods. Summer and winter I have called interequinoctial intervals.

interequinoctial ‎(not comparable)

Coming between the equinoxes.
Summer and winter I have called interequinoctial intervals. — F. Balfour.