1. The celestial equator, so called because the sun traverses it at the time of the equinox. Equinoctial flowers, flowers that open at a regular stated hour. Equinoctial points, the two points where the ecliptic and the equater intersect each other. Equinoctial time, time reckoned from a fixed instant common to all the world.

2. Pertaining to the equinoxes, or to the regions or elimate in or near the equator, or to the time when the sun enters the equinoctial points.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• wquinoctial,
• squinoctial,
• dquinoctial,
• rquinoctial,
• 4quinoctial,
• 3quinoctial,
• e1uinoctial,
• e2uinoctial,
• ewuinoctial,
• eauinoctial,
• eqyinoctial,
• eqhinoctial,
• equanoctial,
• equiinoctials,
• equinoctals,
• equinoxial,
• equinocktial,
• equinockial,
• equanocktial,
• equinoctall

The adjective form of the word "equinoctial" is "equinoctial".

The plural of the "equinoctial" can be the "equinoctials".

The singular of the "equinoctial" can be the "equinoctial".