equinox
Concise Oxford English Dictionary © 2008 Oxford University Press:
equinox /ˈiːkwɪnɒks, ˌɛkwɪ-/
▶noun the time or date (twice each year, about 22 September and 20 March) at which the sun crosses the celestial equator, when day and night are of equal length. ■another term for equinoctial point.
– origin ME: from OFr. equinoxe or L. aequinoctium, from aequi- ‘equal’ + nox, noct- ‘night’.
'equinox' also found in these Oxford entries:
Aquarius
- Aries
- autumn
- Easter
- equinoctial
- harvest moon
- Libra
- spring
- summer
- vernal equinox
- winter
