noun
a limited area of knowledge or endeavor to which pursuits, activities, and interests are confined
a lawyer eminent in her field
Synonyms: bailiwick, champaign, demesne, domain, dominion, precinct, province, region, sphere, terrain, territory, walk
Related Word: bounds, confines, limits; area, department; compass, orbit, purview, range, reach, scope, sweep
Contrasted words: terra incognita