domain
n. countable C1 Advanced Oxford US //doʊˈmeɪn// UK //dəmˈeɪn// do·main
n. a specific area of knowledge, activity, or interest. It can also mean the part of the internet that belongs to a specific person or company.
n. a specific sphere of activity, knowledge, or influence. In computing, it refers to a distinct subset of the internet with a shared address or set of rules.
The scientist is an expert in the domain of physics.
The university decided to register a new domain for its research department to host all academic papers online.
While the legal team handled the contracts, the technical implementation remained strictly within the domain of the engineering department, requiring specialized knowledge of the existing infrastructure.
Usage
Commonly paired with the preposition 'of' to specify the field of interest.