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equator is a noun meaning "an imaginary line around the Earth forming the great circle that is equidistant from the north and south poles". It carries 2 recorded senses.
an imaginary line around the Earth forming the great circle that is equidistant from the north and south poles
“the equator is the boundary between the northern and southern hemispheres”
a circle dividing a sphere or other surface into two usually equal and symmetrical parts
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for equator come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.