What is the meaning of concern?

noun

• Something that interests you because it is important or affects you.
  • usage: "the safety of the ship is the captain's concern"
• An anxious feeling.
  • usage: "care had aged him"; "they hushed it up out of fear of public reaction"
  • synonyms: care, fear
• A feeling of sympathy for someone or something.
  • usage: "She felt strong concern for those less fortunate"
• Something or someone that causes anxiety; a source of unhappiness.
  • usage: "New York traffic is a constant concern"; "it's a major worry"
  • synonyms: worry, headache, vexation
• A commercial or industrial enterprise and the people who constitute it.
  • usage: "he bought his brother's business"; "a small mom-and-pop business"; "a racially integrated business concern"
  • synonyms: business, business concern, business organization, business organisation

verb

• Be relevant to.
  • usage: "There were lots of questions referring to her talk"; "My remark pertained to your earlier comments"
  • synonyms: refer, pertain, relate, come to, bear on, touch, touch on, have-to doe with
• Be on the mind of.
  • usage: "I worry about the second Germanic consonant shift"
  • synonyms: interest, occupy, worry