relating to; regarding; about: a discussion concerning foreign aid.

1375–1425; late Middle English; see concern, -ing2 Unabridged


verb (used with object)
to relate to; be connected with; be of interest or importance to; affect: The water shortage concerns us all.
to interest or engage (used reflexively or in the passive, often followed by with or in ): She concerns herself with every aspect of the business.
to trouble, worry, or disquiet: I am concerned about his health.
something that relates or pertains to a person; business; affair: Law is the concern of lawyers.
a matter that engages a person's attention, interest, or care, or that affects a person's welfare or happiness: The party was no concern of his.
worry, solicitude, or anxiety: to show concern for someone in trouble.
important relation or bearing: This news is of concern to all of us.
a commercial or manufacturing company or establishment: the headquarters of an insurance concern.
Informal. any material object or contrivance.

1375–1425; late Middle English concernen (< Middle French concerner) < Medieval Latin concernere to relate to, distinguish (Late Latin: to mix for sifting), equivalent to Latin con- con- + cernere to sift

overconcern, noun, verb (used with object)
preconcern, noun, verb (used with object)
self-concern, noun

1. touch, involve. 3. disturb. 5. burden, responsibility. Concern, care, worry connote an uneasy and burdened state of mind. Concern implies an anxious sense of interest in something: concern over a friend's misfortune. Care suggests a heaviness of spirit caused by dread, or by the constant pressure of burdensome demands: Poverty weighs a person down with care. Worry is an active state of agitated uneasiness and restless apprehension: He was distracted by worry over the stock market. 8. firm, house.

6. indifference. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
concern (kənˈsɜːn)
vb (usually foll by with or in)
1.  to relate to; be of importance or interest to; affect
2.  to involve or interest (oneself): he concerns himself with other people's affairs
3.  something that affects or is of importance to a person; affair; business
4.  regard for or interest in a person or a thing: he felt a strong concern for her
5.  anxiety, worry, or solicitude
6.  important bearing or relation: his news has great concern for us
7.  a commercial company or enterprise
8.  informal a material thing, esp one of which one has a low opinion
[C15: from Late Latin concernere to mingle together, from Latin com- together + cernere to sift, distinguish]

concerning (kənˈsɜːnɪŋ)
1.  about; regarding; on the subject of
2.  worrying or troublesome

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

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.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
E-mail inquiries concerning this position may be sent to the chair of the
  search committee.
Concerning the development of my comments you still didn't understand it too.
Speculation concerning sea monsters was easy to dismiss.
Perhaps even more concerning are worries about the sustainability of global
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