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 fol. 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.

noun

disinterest , unconcern , inconsequence

verb

unconcern

noun

affair , burden , care , charge , company , corporation , deportment , entanglement , enterprise , establishment , field , firm , house , interest , involvement , job , jungle * , matter , megacorp , mission , multinational , occupation , organization , outfit , shooting match , task , thing , transaction , worry , zoo , apprehension , attention , bearing , carefulness , concernment , consideration , disquiet , disquietude , distress , heed , heedfulness , important matter , reference , regard , relation , relevance , solicitude , tender loving care , unease , lookout , trouble , attentiveness , thoughtfulness , interestedness , consequence , import , moment , significance , significancy , weight , weightiness , angst , anxiousness , nervousness , uneasiness , business , contraption , contrivance , gimmick , jigger , altruism , anxiety , importance , partnership , uneasiness care

verb

apply to , bear on , become involved , be relevant to , bother , disquiet , distress , disturb , interest , involve , make anxious , make uneasy , pertain to , perturb , regard , take pains , touch , trouble , worry , answer to , appertain to , be about , be applicable to , bear upon , be connected with , be dependent upon , be interdependent with , belong to , be pertinent to , be well taken , deal with , depend upon , have a bearing on , have connections with , have implications for , have relation to , have significance for , have to do with , refer to , appertain , pertain , refer , relate , ail , cark , affair , affect , anxiety , apprehension , attentiveness , bear , behold , burden , business , care , cause , charge , company , consideration , corporation , engross , establishment , firm , hold , implicate , matter , misgiving , occupy , solicitude , unease