concern /kənˈsɜːn/ verb [T]
› to be important to someone, or to involve or affect someone: Managers complained that they were spending too much time going to meetings that didn't actually concern them.
› to worry someone: If there are issues which concern you, discuss the matter with a specialist financial adviser.
› (also be concerned with) to be about a particular subject: Our research is concerned with new forms of work organization.
To whom it may concern › COMMUNICATIONS a phrase you write at the beginning of a formal or public letter when you do not know exactly who it should be sent to