perpendicular

perpendicular is defined in Webster's Unabridged Dictionary (1913) with 3 senses, and appears in Roget's Thesaurus (1911) with 40 related terms. The full text of each entry is reproduced verbatim below.

Definitions

  1. 1.(Geom.) At right angles to a given line or surface; as, the line ad is perpendicular to the line bc. Perpendicular style (Arch.), a name given to the latest variety of English Gothic architecture, which prevailed from the close of the 14th century to the early part of the 16th; -- probably so called from the vertical style of its window mullions.
  2. 2.A line at right angles to the plane of the horizon; a vertical line or direction.
  3. 3.(Geom.) A line or plane falling at right angles on another line or surface, or making equal angles with it on each side.

Source: Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).

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Definition-first questions whose answer is perpendicular.

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