v. & n.
v.tr. 1 a be relevant or important to (this concerns you). b relate to; be about. 2 (usu. refl.; often foll. by with, in, about, or to + infin.) interest or involve oneself (don't concern yourself with my problems). 3 worry, affect (it concerns me that he is always late).
n. 1 anxiety, worry (felt a deep concern). 2 a a matter of interest or importance to one (no concern of mine). b (usu. in pl.) affairs, private business (meddling in my concerns). 3 a business, a firm (quite a prosperous concern). 4 colloq. a complicated or awkward thing (have lost the whole concern). have a concern in have an interest or share in. have no concern with have nothing to do with. to whom it may concern to those who have a proper interest in the matter (as an address to the reader of a testimonial, reference, etc.).
[ F concerner or LL concernere (as com-, cernere sift, discern) ]