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• n  the great circle on the celestial sphere midway between the celestial poles
• a  relating to the vicinity of the equator
• a  relating to an equinox (when the lengths of night and day are equal)

• Hardly had the equinoctial orgy begun, when it turned as bleak as a midwinter blizzard.
• An ecumenical rundown of all the world's most important places of worship, from the equinoctial siting at Stonehenge to the bland Meditation Room at the United Nations.
• Additional plotting revealed that alignment of other stones had pinpointed equinoctial positions of the rising and setting sun and moon, enabling Stonehenge observers to .

• celestial equator
• equinoctial circle
• equinoctial line