Merriam-Webster Collegiate Dictionary - concern

 I. verb  Etymology: Middle English, from Middle French & Medieval Latin; Middle French ~er, from Medieval Latin ~ere, from Late Latin, to sift together, mingle, from Latin com- + cernere to sift — more at certain  Date: 15th century  transitive verb  1.  a. to relate to ; be about the novel ~s three soldiers  b. to bear on  2. to have an influence on ; involve; also to be the business or affair of the problem ~s us all  3. to be a care, trouble, or distress to her ill health ~s me  4. engage, occupy he ~s himself with trivia  intransitive verb obsolete to be of importance ; matter  II. noun  Date: 1655  1.  a. marked interest or regard usually arising through a personal tie or relationship  b. an uneasy state of blended interest, uncertainty, and apprehension  2. something that relates or belongs to one ; affair it's no ~ of yours  3. matter for consideration  4. an organization or establishment for business or manufacture a banking ~  5. contrivance, gadget  Synonyms: see care