Source : Webster's Revised Unabridged Dictionary (1913)

Firm \Firm\, a. [Compar. {Firmer}; superl. {Firmest}.] [OE.
   ferme, F. ferme, fr.L. firmus; cf. Skr. dharman support, law,
   order, dh? to hold fast, carry. Cf. {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.

   Syn: Compact; dense; hard; solid; stanch; robust; strong;
        sturdly; fixed; steady; resolute; constant.

Firm \Firm\, n. [It. firma the (firm, sure, or confirming)
   signature or subscription, or Pg. firma signature, firm, cf.
   Sp. firma signature; all fr. L. 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 \Firm\, v. t. [OE. fermen to make firm, F. fermer, fr. L.
   firmare to make firm. See {Firm}, a.]
   1. To fix; to settle; to confirm; to establish. [Obs.]

            And Jove has firmed it with an awful nod. --Dryden.

   2. To fix or direct with firmness. [Obs.]

            He on his card and compass firms his eye. --Spenser.

Source : WordNet®

firm
     adv : with resolute determination; "we firmly believed it"; "you
           must stand firm" [syn: {firmly}, {steadfastly}, {unwaveringly}]

firm
     adj 1: marked by firm determination or resolution; not shakable;
            "firm convictions"; "a firm mouth"; "steadfast
            resolve"; "a man of unbendable perseverence";
            "unwavering loyalty" [syn: {steadfast}, {steady}, {unbendable},
             {unfaltering}, {unshakable}, {unwavering}]
     2: not soft or yielding to pressure; "a firm mattress"; "the
        snow was firm underfoot"; "solid ground" [syn: {solid}]
     3: strong and sure; "a firm grasp"; "gave a strong pull on the
        rope" [syn: {strong}]
     4: not subject to revision or change; "a firm contract"; "a
        firm offer"
     5: (of especially a person's physical features) not shaking or
        trembling; "his voice was firm and confident"; "a firm
        step"
     6: not liable to fluctuate or especially to fall; "stocks are
        still firm" [syn: {steady}, {unfluctuating}]
     7: securely established; "an established reputation"; "holds a
        firm position as the country's leading poet" [syn: {established}]
     8: marked by the tone and resiliency of healthy tissue; "firm
        muscles"
     9: pleasingly firm and fresh and making a crunching noise when
        chewed; "crisp carrot and celery sticks"; "a firm apple";
        "crunchy lettuce" [syn: {crisp}, {crunchy}]
     10: securely fixed in place; "the post was still firm after
         being hit by the car" [syn: {fast}, {immobile}]
     11: unwavering in devotion to friend or vow or cause; "a firm
         ally"; "loyal supporters"; "the true-hearted soldier...of
         Tippecanoe"- Campaign song for William Henry Harrison;
         "fast friends" [syn: {loyal}, {truehearted}, {fast(a)}]

firm
     n : members of a business organization that owns or operates one
         or more establishments; "he worked for a brokerage house"
         [syn: {house}, {business firm}]

firm
     v 1: become taut or tauter; "Yur muscles will firm when you
          exercise regularly"; "the rope tautened" [syn: {tauten}]
     2: make taut or tauter; "tauten a rope" [syn: {tauten}]