expeditiona journey undertaken by a group of people with a particular purpose, especially discoveryThe Lewis and Clark expedition mapped vast stretches of the western United States in the early 1800s.NoteThe Lewis and Clark expedition mapped vast stretches of the western United States in the early 1800s.Elon.io is an online learning platformWe have an entire course teaching TOEFL Academic Vocabulary grammar and vocabulary.Start learning TOEFL Academic Vocabulary now