simple past tense and past participle of concern

Showing concern. / Involved or responsible.

(obsolete, rare) Relevance.

plural of concernment

(obsolete) concerned; having involvement or responsibility

plural of concerning

(programming) The process of separating a computer program into distinct features that overlap functionally as little as possible.

plural of going concern

An operating enterprise.

(Internet slang) Someone who posts to an internet forum or newsgroup, claiming to share its goals while deliberately working against those goals, typically, by claiming "concern" about group plans to engage in productive activity, urging members instead to attempt some activity that would damage the group's credibility, or alternatively to give up on group projects entirely.