1 definition found From The Collaborative International Dictionary of English v.0.44 [gcide]: Trinal \Tri"nal\, adjective [L. trinus triple, trini three each, fr. tres, tria, three. See {Three}, and cf. {Trine}, adjective & n., {Tern}, adjective] Threefold. ''Trinal unity.'' --Milton. In their trinal triplicities on high. --Spenser.

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