concern Look up concern at Dictionary.com
mid-15c., from M.L. concernere "concern, touch, belong to," figurative use of L.L. concernere "to sift, mix, as in a sieve," from L. com- "with" + cernere "to sift," hence "perceive, comprehend" (see crisis). Apparently the sense of the prefix shifted to intensive in M.L. Meaning of "relate to" is 16c.; "worry" is 17c. To whom it may concern first recorded 1868.