Concern  —v. 1 a be relevant or important to. B relate to; be about. 2 (refl.; often foll. By with, about, in) interest or involve oneself. 3 worry, affect. —n. 1 anxiety, worry. 2 a matter of interest or importance to one. B interest, connection (has a concern in politics). 3 business, firm. 4 colloq. Complicated thing, contrivance. [latin cerno sift]