noun, plural trajectories.
the curve described by a projectile, rocket, or the like in its flight.
Geometry. a curve or surface that cuts all the curves or surfaces of a given system at a constant angle.

1660–70; < Neo-Latin trājectōria, noun use of feminine of Medieval Latin trājectōrius cast-ing over. See traject, -tory1

trajectile [truh-jek-til, -tahyl] , adjective
trajection [truh-jek-shuhn] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trajectory (trəˈdʒɛktərɪ, -trɪ)
n , pl -ries
1.  the path described by an object moving in air or space under the influence of such forces as thrust, wind resistance, and gravity, esp the curved path of a projectile
2.  geometry a curve that cuts a family of curves or surfaces at a constant angle

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1696, from Mod.L. trajectoria, from fem. of trajectorius "of or pertaining to throwing across," from L. trajectus "thrown over or across," pp. of trajicere "throw across," from L. trans- "across" + icere, combining form of jacere "to throw" (see jet). Used in L.L. and M.E. to mean "a funnel."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
trajectory   (trə-jěk'tə-rē)  Pronunciation Key 
  1. Physics The line or curve described by an object moving through space.

  2. Mathematics A curve or surface that passes through a given set of points or intersects a given series of curves or surfaces at a constant angle.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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