aqueduct vs trajectory

aqueduct

noun
  • An artificial channel that is constructed to convey water from one location to another. 

  • A structure carrying water over a river or depression, especially in regards to ancient aqueducts. 

  • A structure conveying fluid, such as the cerebral aqueduct or vestibular aqueduct. 

trajectory

noun
  • The path of a body as it travels through space. 

  • The ordered set of intermediate states assumed by a dynamical system as a result of time evolution. 

  • The path an object takes as it moves. 

  • A course of development, such as that of a war or career. 

How often have the words aqueduct and trajectory occurred in a corpus of books? (source: Google Ngram Viewer )