Definitions of concerned:

• adjective:   involved in or affected by or having a claim to or share in

  Example: "A memorandum to those concerned"

• adjective:   in relation (or in regard) to; especially as in the phrases

  Example: "As far as x is concerned"

• adjective:   feeling or showing worry or solicitude

  Example: "Concerned parents of youthful offenders"

• adjective:   culpably involved

  Example: "All those concerned in the bribery case have been identified"