To have to do with or relate to: an article that concerns the plight of homeless people. To be of interest or importance to: This problem concerns all of us. To engage the attention of; involve: We concerned ourselves with accomplishing the task at hand. To cause anxiety or uneasiness in: The firm's weak financial posture is starting to concern its stockholders. Obsolete To be of importance. A matter that relates to or affects one. See Synonyms at affair. Regard for or interest in someone or something. A troubled or anxious state of mind arising from solicitude or interest. See Synonyms at anxiety. A business establishment or enterprise; a firm. A contrivance; a gadget.