Webster's Revised Unabridged Dictionary · 1913

Firm

Firm , adjective

[Old English ferme, French ferme, fromL. firmus; compare Sanskrit dharman support, law, order, dh{not transcribed} to hold fast, carry. Compare Farm, Throne.]

1.
Fixed; hence, closely compressed; compact; substantial; hard; solid; -- applied to the matter of bodies; as, firm flesh; firm muscles, firm wood.
2.
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.
Under spread ensigns, moving nigh, in slow But firm battalion. — Milton
By one man's firm obediency fully tried. — Milton
3.
Solid; -- opposed to fluid; as, firm land.
4.
Indicating firmness; as, a firm tread; a firm countenance.

Firm , noun

[Italian firma the (firm, sure, or confirming) signature or subscription, or Portuguese firma signature, firm, compare Sp. firma signature; all from Latin firmus, adj., firm. See Firm, a.]

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.

Firm , transitive verb

[Old English fermen to make firm, French fermer, from Latin firmare to make firm. See Firm, a.]

1.
To fix; to settle; to confirm; to establish. [Obsolete]
And Jove has firmed it with an awful nod. — Dryden
2.
To fix or direct with firmness. [Obsolete]
He on his card and compass firms his eye. — Spenser