(bound form) line of business; trade; profession; commercial firm; seniority among siblings; expertise in a certain field; skill acquired through practice

inside; within; inner; internal; specifically refers to the interior or domestic domain as opposed to the exterior or foreign domain; often used in spatial or temporal contexts

people of a certain type or from a particular circle, often implying a degree of social status or public presence (e.g., in fields like politics, art, or charity)