Perpendicularity

per·pen·dic·u·lar  (pûrpn-dky-lr)

adj.

1. Mathematics Intersecting at or forming right angles.

2. Being at right angles to the horizontal; vertical. See Synonyms at vertical.

3. often Perpendicular Of or relating to a style of English Gothic architecture of the 14th and 15th centuries, characterized by emphasis of the vertical element.

n.

1. Mathematics A line or plane perpendicular to a given line or plane.

2. A perpendicular position.

3. A device, such as a plumb line, used in marking the vertical from a given point.

4. A vertical or nearly vertical line or plane.

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[Middle English perpendiculer, from Old French, from Latin perpendiculris, from perpendiculum, plumb line, from perpendere, to weigh carefully : per-, per- + pendere, to weigh; see (s)pen- in Indo-European roots.]

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perpen·dicu·lari·ty (-lr-t) n.

perpen·dicu·lar·ly adv.

Thesaurus

Noun	1.	perpendicularity - the relation of opposition between things at right angles orthogonal opposition, orthogonality opposition - a direction opposite to another
	2.	perpendicularity - the quality of being at right angles to a given line or plane (especially the plane of the horizon) oblongness, rectangularity - the property of being shaped like a rectangle