Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun frontier

3 senses of frontier

Sense 1
frontier -- (a wilderness at the edge of a settled area of a country; "the individualism of the frontier in Andrew Jackson's day")
       => wilderness, wild -- (a wild and uninhabited area left in its natural condition; "it was a wilderness preserved for the hawks and mountaineers")

Sense 2
frontier -- (an international boundary or the area (often fortified) immediately inside the boundary)
       => boundary, bound, bounds -- (the line or plane indicating the limit or extent of something)

Sense 3
frontier -- (an undeveloped field of study; a topic inviting research and development; "he worked at the frontier of brain science")
       => discipline, subject, subject area, subject field, field, field of study, study, bailiwick -- (a branch of knowledge; "in what discipline is his doctorate?"; "teachers should be well trained in their subject"; "anthropology is the study of human beings")