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WordReference Random House Learner's Dictionary of American English © 2024per•pen•dic•u•lar /ˌpɜrpənˈdɪkyəlɚ/USA pronunciation adj. - Mathematicsvertical;
straight up and down;
upright. - Mathematicsmeeting at right angles:Forty-second Street is perpendicular to Fifth Avenue.
n. [countable] - Mathematicsa perpendicular line, plane, or position.
See -pend-. WordReference Random House Unabridged Dictionary of American English © 2024per•pen•dic•u•lar (pûr′pən dik′yə lər),USA pronunciation adj. - Mathematicsvertical;
straight up and down;
upright. - Mathematics[Geom.]meeting a given line or surface at right angles.
- maintaining a standing or upright position;
standing up. - having a sharp pitch or slope;
steep. - Architecture(cap.) noting or pertaining to the last style of English Gothic architecture, prevailing from the late 14th through the early 16th century and characterized by the use of predominantly vertical tracery, an overall linear, shallow effect, and fine intricate stonework.
n. - Mathematicsa perpendicular line or plane.
- an instrument for indicating the vertical line from any point.
- an upright position.
- a sharply pitched or precipitously steep mountain face.
- moral virtue or uprightness;
rectitude. - Nautical, Naval Termseither of two lines perpendicular to the keel line, base line, or designed water line of a vessel.
- Old French perpendiculiere
- Latin perpendiculāris vertical, equivalent. to perpendicul(um) plumb line (see perpend2, -i-, -cule2) + -āris -ar1; replacing Middle English perpendiculer(e) (adjective, adjectival and adverb, adverbial)
- 1350–1400
- 1.See corresponding entry in Unabridged standing. See upright.
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