<p><strong>Verb</strong></p><ul><li>to relate to; be connected with; be of interest or importance to; affect: The water shortage concerns us all.</li><li>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.</li><li>to trouble, worry, or disquiet: I am concerned about his health.</li></ul><p><strong>Noun</strong></p><ul><li>something that relates or pertains to a person; business; affair: Law is the concern of lawyers.</li><li>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.</li><li>Synonyms: responsibility, burden</li><li>worry, solicitude, or anxiety: to show concern for someone in trouble.</li><li>Antonyms: indifference</li><li>important relation or bearing: This news is of concern to all of us.</li><li>a commercial or manufacturing company or establishment: the headquarters of an insurance concern.</li><li>Synonyms: house, firm</li><li>Informal: any material object or contrivance.</li></ul>