The noun concern has 5 senses (first 5 from tagged texts)
1. (248) concern -- (something that interests you because it is important or affects you; "the safety of the ship is the captain's concern")
2. (200) concern, care, fear -- (an anxious feeling; "care had aged him"; "they hushed it up out of fear of public reaction")
3. (50) business, concern, business concern, business organization, business organisation -- (a commercial or industrial enterprise and the people who constitute it; "he bought his brother's business"; "a small mom-and-pop business"; "a racially integrated business concern")
4. (42) concern, worry, headache, vexation -- (something or someone that causes anxiety; a source of unhappiness; "New York traffic is a constant concern"; "it's a major worry")
5. (36) concern -- (a feeling of sympathy for someone or something; "She felt strong concern for those less fortunate")
Overview of verb concern
The verb concern has 2 senses (first 2 from tagged texts)
1. (56) refer, pertain, relate, concern, come to, bear on, touch, touch on -- (have to do with or be relevant to; "There were lots of questions referring to her talk"; "My remark pertained to your earlier comments")
2. (22) concern, interest, occupy, worry -- (be on the mind of; "I worry about the second Germanic consonant")