concern in WordNet English dictionary

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

1. 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"
   business  concern  business concern  business organization  business organisation 
   
2. an anxious feeling
   "care had aged him"; "they hushed it up out of fear of public reaction"
   concern  care  fear 
   
3. something that interests you because it is important or affects you
   "the safety of the ship is the captain's concern"
   concern 
   
4. something or someone that causes anxiety; a source of unhappiness
   "New York traffic is a constant concern"; "it's a major worry"
   concern  worry  headache  vexation 
   
5. a feeling of sympathy for someone or something
   "She felt strong concern for those less fortunate"
   concern