[ trə'dʒɛkt(ə)ri , 'tradʒɪkt(ə)ri ]
■ noun ( plural trajectories )
1》 the path described by a projectile flying or an object moving under the action of given forces.
2》 Geometry a curve or surface cutting a family of curves or surfaces at a constant angle.
Origin
C17: from mod. L. trajectoria (fem.), from L. traject- , traicere 'throw across'.