domain

Reading level: hard

Estimated CEFR level: B2 — Upper-Intermediate

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun a particular environment or walk of life
  2. noun territory over which rule or control is exercised
  3. noun (mathematics) the set of values of the independent variable for which a function is defined

Etymology

From Middle English demayne, demain (“rule”), from Old French demeine, demaine, demeigne, domaine (“power”), (French domaine), from Latin dominium (“property, right of ownership”), from dominus (“master, proprietor, owner”). Doublet of demesne and dominium, and closely related to dominion and domino. See also dame, and compare demain, danger, dungeon.

In classic literature

Synonyms

sphere, area, orbit, field, arena

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