Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Moving in, consisting of, bounded by, or characterized by a straight line or lines: following a rectilinear path; rectilinear patterns in wallpaper.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. In a straight line.
  • adj. Formed from straight lines.

from The Century Dictionary and Cyclopedia

  • Straight-lined; bounded by straight lines; consisting of a straight line or of straight lines; straight: as, a rectilinear figure or course. Also rectilineal.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. characterized by a straight line or lines

Etymologies

From Late Latin rēctilīneus : Latin rēctus, right; see reg- in Indo-European roots + Latin līnea, line; see line1.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From post-Classical Latin; either from rectilīneāris or from rectilīneus (whence rectiline) + -ar, in both cases ultimately deriving from rectus ("straight") + līnea ("line"). (Wiktionary)

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