B2[C or U]something that is important to you, or the fact of being important: [+ to infinitive]His concern to appear sophisticated amused everyone.The company's sole concern is to ensure the safety of its employees.There's a matter of some concern that I have to discuss with you.Anxiety and worry - general wordsFear and phobias›[C or U]something that involves or affects you or is important to you: What were the major concerns of the writers from this period?I don't want to hear about it - it's no concern of mine!"What's happening?" "That's none of/not any of your concern."Linking and relatingRegarding and concerningbe of concern›to be important: The results of the election are of concern to us all.Linking and relatingRegarding and concerning