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late 15c., from Latin truncatus "cut off," past participle of truncare "to maim, cut off," from truncus "mutilated, cut off" (see trunk). Related: Truncated; truncating.
truncate trun·cate (trŭng'kāt')v. trun·cat·ed, trun·cat·ing, trun·cates To shorten by or as if by cutting off, especially by cutting across at right angles to the long axis.