adv. [f. as prec. + -LY2.] In a triangular way; in the form or manner of a triangle.

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1604.  T. Wright, Passions, V. 221. The heart … of man triangularly respecteth the blessed Trinitie, every corner a Person, and the solide substance your common Essence.

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1670.  Norden, Spec. Brit., Cornw. (1728), 70. 3 whyte stones sett triangulerly as pillers supportinge another stone.

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1681.  Grew, Musæum, III. I. v. 307. A Spar with Crystals Triangularly pointed.

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1702.  W. J., trans. Bruyn’s Voy. Levant, xxxiv. 134. This Town is Triangularly built.

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  b.  fig. As three parties to a transaction (cf. TRIANGULAR 3).

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1892.  Sat. Rev., 31 Dec., 758/2. The Russian refusal to negotiate ‘triangularly’ with England and China.

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