noun
plural -cerns
a feeling of worry usually shared by many people [noncount]
[count] :something that causes people to worry
a feeling of being interested in and caring about a person or thing [noncount]
[count] :something that is regarded as important
[count] :something that a person is responsible for or involved in - usually singular
[count] formal :a business or company
verb
-cerns; -cerned; -cerning
[+ obj] to relate to (something or someone) :to be about (something or someone)
to affect or involve (someone) :to be the business or interest of (someone)
The phrase To whom it may concern is used at the beginning of a formal letter (such as a letter written to a company) when the name of the person who will read the letter is not known.
to make (someone) worried :to cause concern for (someone)
concern yourself
to become involved or interested in something :to give your attention to something