equinox
C1Formal, Academic, Technical
Definition
Meaning
Either of the two times in the year when the sun crosses the celestial equator, making day and night of equal length everywhere on Earth.
A point in time or a symbolic moment of balance, transition, or equality. It can be used metaphorically in fields like astrology, mythology, and literature.
Linguistics
Semantic Notes
Specifically refers to two annual events: the vernal/spring equinox (~March 20) and the autumnal/fall equinox (~September 22). The term focuses on the astronomical event of equal day/night.
Dialectal Variation
British vs American Usage
Differences
No major differences in meaning. 'Autumnal equinox' is standard in both, but 'fall equinox' is more common in AmE.
Connotations
Similar connotations of balance, change of seasons, and natural cycles. May carry stronger historical/ceremonial connotations in UK (e.g., Stonehenge).
Frequency
Equally used in both varieties in relevant contexts (science, weather, culture).
Vocabulary
Collocations
Grammar
Valency Patterns
the [vernal/autumnal/spring/fall] equinox of [year][event] coincides with the equinoxat/on the equinoxVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[No common idioms directly with 'equinox']”
Usage
Context Usage
Business
[Not typically used]
Academic
Used in astronomy, geography, environmental studies, and history to describe precise celestial events and their impacts.
Everyday
Used when discussing seasons, weather changes, or cultural events tied to the equinoxes.
Technical
Precise term in astronomy and geodesy for when the sun's centre passes through the celestial equator.
Examples
By Part of Speech
verb
British English
- [No standard verb form]
American English
- [No standard verb form]
adverb
British English
- [No standard adverb form]
American English
- [No standard adverb form]
adjective
British English
- The equinoctial gales are expected this week.
- They calculated the equinoctial point.
American English
- Equinoctial storms often hit the coast.
- The equinoctial line is a key reference.
Examples
By CEFR Level
- Spring starts at the equinox.
- The days get longer after the spring equinox.
- Many cultures have festivals for the autumn equinox.
- The precise timing of the vernal equinox varies slightly each year.
- Solar panels are most efficient around the equinoxes when the sun is directly over the equator.
- The precession of the equinoxes means that the astrological signs no longer align with the constellations from which they took their names.
- Archaeoastronomers study how ancient monuments like Stonehenge are aligned with equinoctial sunrises.
Learning
Memory Aids
Mnemonic
EQUInox = EQUal night (nox is Latin for night).
Conceptual Metaphor
A POINT OF BALANCE (life/death, light/dark); A GATEWAY or THRESHOLD (between seasons).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Прямой перевод 'равноденствие' is correct and accurate. No significant traps.
Common Mistakes
- Confusing 'equinox' (equal day/night) with 'solstice' (longest/shortest day).
- Using 'equinox' to refer to any change of season.
- Mispronouncing as /ˈiːkwɪnɒks/.
Practice
Quiz
What is the primary characteristic of an equinox?
FAQ
Frequently Asked Questions
Two: the vernal (spring) equinox and the autumnal (fall) equinox.
Not exactly, due to atmospheric refraction and the definition of sunrise/sunset. The day is slightly longer. The term 'equilux' refers to the date when day and night are exactly equal.
An equinox marks equal day/night and the start of spring/autumn. A solstice marks the longest (summer) or shortest (winter) day and the start of summer/winter.
Yes, the equinox is a single global moment in time. However, it marks the beginning of spring in one hemisphere and autumn in the other.