1. (superl.) Fixed; hence, closely compressed; compact; substantial; hard; solid; -- applied to the matter of bodies; as, firm flesh; firm muscles, firm wood.

2. (superl.) Not easily excited or disturbed; unchanging in purpose; fixed; steady; constant; stable; unshaken; not easily changed in feelings or will; strong; as, a firm believer; a firm friend; a firm adherent.

3. (superl.) Solid; -- opposed to fluid; as, firm land.

4. (superl.) Indicating firmness; as, a firm tread; a firm countenance.

5. (n.) The name, title, or style, under which a company transacts business; a partnership of two or more persons; a commercial house; as, the firm of Hope & Co.

6. (v.) To fix; to settle; to confirm; to establish.

7. (v.) To fix or direct with firmness.