equatorial (Adjective) — Of or relating to or at an equator. ex. "equatorial diameter"
equatorial (Adjective) — Of or relating to conditions at the geographical equator. ex. "equatorial heat"
equatorial (Adjective) — Of or existing at or near the geographic equator. ex. "equatorial Africa"
equatorial (Noun) — A telescope whose mounting has only two axes of motion, one parallel to the Earth's axis and the other one at right angles to it.