concern

That which affects one’s welfare or happiness. A matter of interest to someone.countableuncountable

• Mark’s health was of great concern to Connie.

The placement of interest or worry on a subject.countableuncountable

• Most people in Australia have no concern for the recent events in London.

A worry; a sense that something may be wrong; an identification of a possible problem.countableuncountable

• Let me know if you have any questions or concerns about the document.

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

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

A business, firm or enterprise; a company.countableuncountable

• The employees’ attitude is really hurting the concern.
• a going concern

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

• At the programming level, an aspect is a modular unit that implements a concern.

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

• Preaching the kingdom of God, and teaching those things which concern the Lord Jesus Christ.
• our wars with France have always affected us in our most tender interests, and concerned us more than those we have had with any other nation

To engage by feeling or sentiment; to interest.transitive

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

To make somebody worried.transitive

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