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equinox

The time or date (occurring twice each year) when the sun is exactly above the equator, making day and night of equal length.

/ˈiːkwɪˌnɒks/

[C] Countable
pl: equinoxes

This term describes a precise astronomical moment of balance. It carries a connotation of symmetry and transition, serving as a cosmic pivot point between the expanding light of summer and the encroaching darkness of winter.

While "solstice" refers to the extremes of the solar cycle (longest or shortest day), "equinox" represents the exact midpoint. It is used primarily in scientific, astrological, or seasonal contexts to mark a change in the earth's tilt relative to the sun.

Used to refer to the specific occurrences in the yearly cycle, such as the two distinct equinoxes that happen every year.

💬Casual Conversation

🎬Tuesday afternoon, Maya is trying to organize a group hiking trip.
Maya

Stop slacking. We're hitting the trail on the equinox or it's not happening.

Stop slacking. We're hitting the trail on the equinox or it's not happening.

Maya
Ryan
Ryan

Wait, what even is an equinox? Bet we can just go next week.

Wait, what even is an equinox? Bet we can just go next week.

Meanings

Noun

The time or date (occurring twice each year) when the sun is exactly above the equator, making day and night of equal length.

The vernal equinox marks the beginning of spring in the Northern Hemisphere.

Etymology

Derived from the Latin aequinoctium, which is a compound of aequus meaning equal and nox meaning night.

Related Words

Last Updated: June 22, 2026Report an Error