Webster's English Dictionary

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trine

1. trine \'tri-n\ aj [ME, fr. MF trin, fr. L trinus, back-formation fr. 
   trini thre]e each; akin to L tres three - more at THREE 1: THREEFOLD, 
   TRIPLE  2: of, relating to, or being the favorable astrological aspect of 
   two heav enly bodies 120 degrees apart
2. trine n 1a: a group of three : TRIAD  cap  1b: TRINITY  2: the trine 
   astrological aspect of two heavenly bodies