Source : Webster's Revised Unabridged Dictionary (1913)

Cozier \Co*zier\ (k?"zh?r), n.
   See {Cosier}.

Cozy \Co"zy\ (k?"z?), a. [Compar. {Cozier} (-z?-?r); superl.
   {Coziest}.] [Cf. Scot. cosie, cozie, prob. from Gael. cosach
   abounding in hollows, or cosagach full of holes or crevices,
   snug, sheltered, from cos a hollow, a crevice.]
   1. Snug; comfortable; easy; contented. [Written also {cosey}
      and {cosy}.]

   2. [Cf. F. causer to chat, talk.] Chatty; talkative;
      sociable; familiar. [Eng.]

Source : WordNet®

cozier
     See {cozy}

cozy
     adj 1: enjoying or affording comforting warmth and shelter
            especially in a small space; "a cozy nook near the
            fire"; "snug in bed"; "a snug little apartment" [syn:
            {cosy}, {snug}]
     2: having or fostering a warm or friendly atmosphere;
        especially through smallness and informality; "had a cozy
        chat"; "a relaxed informal manner"; "an intimate cocktail
        lounge"; "the small room was cozy and intimate" [syn: {intimate},
         {informal}]
     3: suggesting connivance; "a cozy arrangement with the police"
     n : a padded cloth covering to keep a teapot warm [syn: {cosy},
         {tea cosy}, {cosey}, {tea cosey}, {tea cozy}, {cozey}, {tea
         cozey}, {cozie}, {tea cozie}]
     [also: {coziest}, {cozier}]