An alien coming temporarily to the United States as a participant in a program approved by the Secretary of State for the purpose of teaching, instructing or lecturing, studying, observing, conducting research, consulting, demonstrating special skills, or receiving training.
Source: U.S. Citizenship and Immigration Services
A foreign citizen coming to the United States to participate in a particular program in education, training, research, or other authorized exchange visitor program.
Source: U.S. Department of State.