Refers to an abstract or conceptual area, such as a sphere of influence, knowledge, or activity. Often used in formal or technical contexts.
This research belongs to an interdisciplinary sphere.
Expansion of the economic sphere is expected.
Compound of 圏 (けん, 'sphere' or 'range') and 域 (いき, 'area' or 'region'). The exact historical derivation is uncertain, but the combination naturally expresses a bounded conceptual area.