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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Example sentences
Certainly in astrophysics, such helices are the trajectories of the planets
  about a moving sun.
When the sun is held stationary, these trajectories are viewed as nearly
  circular ellipses.
Literally hundreds of other names have followed similar trajectories.
Both sets of companies are now in messy public divorces, because the parent
  companies had to change their trajectories.
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