boundary / a bounded area or region / a bounded group of people, a society, a world as a social grouping, such as business, celebrities, or finance / the border edge of a thing

border, boundary, limits

stem or continuative form of 知る (shiru) [godan]

Alternative spelling of 物知り: a person with broad knowledge, a knowledgeable person

animal

diversification

diversify

Synonym of 十人十色 (jūnin toiro, “there's no accounting for taste”)

The world of entertainment

business world; business circles