Real Dictionary

particular
You use particular to emphasize that you are talking about one thing or one kind of thing rather than other similar ones.

particular in American English
of or belonging to a single, definite person, part, group, or thing; not general; distinct
adjective: of or pertaining to a single or specific person, thing, group, class, occasion, etc., rather than to others or all; special rather than general
noun: an individual or distinct part, as an item of a list or enumeration

particular in British English
adjective: of or belonging to a single or specific person, thing, category, etc; specific; special