trajectories Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. the paths followed by moving objects. Example Sentence The trajectories of the two rockets were carefully calculated to avoid collision. More Example Sentences Students studied the trajectories of projectiles. Synonyms paths; courses; routes Antonyms stillness; immobility Hear It! Say It! Write It! trajectories Switch to cursive Start Share with your friends: