a. A man or boy.
b. Informal A boyfriend.
2. A comrade or associate.
a. A person of equal rank, position, or background; a peer.
b. One of a pair; a mate: found the lost shoe and its fellow.
4. A member of a learned society or professional organization.
a. A graduate student appointed to a position granting financial aid and providing for further study.
b. A physician who enters a training program in a medical specialty after completing residency, usually in a hospital or academic setting.
6. Chiefly British
a. An incorporated senior member of certain colleges and universities.
b. A member of the governing body of certain colleges and universities.
7. Archaic A man or boy held in low regard.
Being of the same kind, group, occupation, society, or locality; having in common certain characteristics or interests: fellow workers.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.