1. specialist; expert; professional; authority; pundit
Wikipedia definition
2. ExpertAn expert (also called cognoscente) is someone widely recognized as a reliable source of technique or skill whose faculty for judging or deciding rightly, justly, or wisely is accorded authority and status by their peers or the public in a specific well-distinguished domain. An expert, more generally, is a person with extensive knowledge or ability based on research, experience, or occupation and in a particular area of study.
Read “Expert” on English Wikipedia
Read “専門家” on Japanese Wikipedia
Read “Expert” on DBpedia


to talk about this word.