—adj.
1 threefold, triple; made up of three parts.
2 Astrol. denoting the aspect of two heavenly bodies 120° (one-third of the zodiac) apart.
—n. Astrol. a trine aspect.
Derivatives:
trinal adj.
Etymology: ME f. OF trin trine f. L trinus threefold f. tres three
Useful english dictionary. 2012.