Meaning

• That which affects one’s welfare or happiness. A matter of interest to someone. The adposition before the matter of interest is usually over, about or for.

  "Judy's eyes filled with concern as she listened to the news report."

• The expression of solicitude, anxiety, or compassion toward a thing or person.

• A business, firm or enterprise; a company.

  "The employees’ attitude is really hurting the concern."

• Any set of information that affects the code of a computer program.

Meaning

• To relate or belong to; to have reference to or connection with; to affect the interest of; to be of importance to.

• To engage by feeling or sentiment; to interest.

  "A good prince concerns himself in the happiness of his subjects."

• To make somebody worried.

  "I’m concerned that she’s becoming an alcoholic."