Possible Definitions:
1. Firm (superl.) Fixed; hence, closely compressed; compact; substantial; hard; solid; -- applied to the matter of bodies; as, firm flesh; firm muscles, firm wood.
2. Firm (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. Firm (superl.) Solid; -- opposed to fluid; as, firm land.
4. Firm (superl.) Indicating firmness; as, a firm tread; a firm countenance.
5. Firm (a.) To fix; to settle; to confirm; to establish.
6. Firm (a.) To fix or direct with firmness.
