Etymology
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concern (v.)

early 15c., of persons, "to perceive, distinguish;" also, of things, "to refer to, relate to, pertain to," from Old French concerner (15c.) and directly from Medieval Latin concernere "concern, touch, belong to," figurative use of Late Latin concernere "to sift, mix as in a sieve," from assimilated form of Latin com "with, together" (see con-) + cernere "to sift," hence "perceive, comprehend" (from PIE root *krei- "to sieve," thus "discriminate, distinguish").

Apparently the sense of the first element shifted to intensive in Medieval Latin. From late 15c. as "to affect the interest of, be of importance to;" hence the meaning "to worry, disturb, make uneasy or anxious" (17c.). Reflexive use "busy, occupy, engage" ("concern oneself") is from 1630s. Related: Concerned; concerning.

Used imperatively from 1803 (compare similar use of confound); often rendered in dialect as consarn (1832), probably a euphemism for damn (compare concerned). Letter opening to whom it may concern attested by 1740.

concern (n.)

1580s, "regard, reference" (a sense now obsolete), from concern (v.). Meaning "that which relates or pertains to one" is from 1670s. Meaning "solicitous regard" is from 1690s. Sense of "an establishment for the transaction of business" is from 1680s.; colloquial sense of "a cumbersome or complicated material object" is from 1824. As nouns in 17c. concernance, concernancy, concernment also were used.

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Definitions of concern
1
concern (n.)
something that interests you because it is important or affects you;
the safety of the ship is the captain's concern
concern (n.)
an anxious feeling;
Synonyms: care / fear
concern (n.)
a feeling of sympathy for someone or something;
She felt strong concern for those less fortunate
concern (n.)
something or someone that causes anxiety; a source of unhappiness;
New York traffic is a constant concern
Synonyms: worry / headache / vexation
concern (n.)
a commercial or industrial enterprise and the people who constitute it;
a racially integrated business concern
Synonyms: business / business concern / business organization / business organisation
2
concern (v.)
be relevant to;
Synonyms: refer / pertain / relate / come to / bear on / touch / touch on / have to do with
concern (v.)
be on the mind of;
Synonyms: interest / occupy / worry
From wordnet.princeton.edu