Meaning of the word equinox in English

What does equinox mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

equinox

US /ˈek.wə.nɑːks/
UK /ˈek.wɪ.nɒks/

Noun

the time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of equal length

Example:
The vernal equinox marks the beginning of spring.
There are two equinoxes each year, one in spring and one in autumn.