The Collaborative International Dictionary of English v.0.48:

Trine \Trine\, v. t.
   To put in the aspect of a trine. [R.]
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         By fortune he [Saturn] was now to Venus trined.
                                                  --Dryden.
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The Collaborative International Dictionary of English v.0.48:

Trine \Trine\, a. [See Trinal.]
   Threefold; triple; as, trine dimensions, or length, breadth,
   and thickness.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Trine \Trine\, n. [F. trine, trin. See Trinal.]
   1. (Astrol.) The aspect of planets distant from each other
      120 degrees, or one third of the zodiac; trigon.
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            In sextile, square, and trine.        --Milton.
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   2. A triad; trinity. [R.]
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            A single trine of brazen tortoises.   --Mrs.
                                                  Browning.
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            Eternal One, Almighty Trine!          --Keble.
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WordNet (r) 3.0 (2006):

trine
    n 1: the cardinal number that is the sum of one and one and one
         [syn: three, 3, III, trio, threesome, tierce,
         leash, troika, triad, trine, trinity, ternary,
         ternion, triplet, tercet, terzetto, trey, deuce-
         ace]