Synonyms of frontier

Noun

1. frontier, wilderness, wild

usage: a wilderness at the edge of a settled area of a country; "the individualism of the frontier in Andrew Jackson's day"

2. frontier, boundary, bound, bounds

usage: an international boundary or the area (often fortified) immediately inside the boundary

3. frontier, discipline, subject, subject area, subject field, field, field of study, study, bailiwick

usage: an undeveloped field of study; a topic inviting research and development; "he worked at the frontier of brain science"

Definition and meaning of frontier (Dictionary)