The Collaborative International Dictionary of English v.0.48:

Boss \Boss\ (b[o^]s), v. t. [imp. & p. p. Bossed (b[o^]st); p.
   pr. & vb. n. Bossing.] [OE. bocen, fr. OF. bocier. See the
   preceding word.]
   To ornament with bosses; to stud.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Boss \Boss\, n. [D. baas master.]
   A master workman or superintendent; a director or manager; a
   political dictator. [Slang, U. S.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Boss \Boss\ (b[o^]s; 115), n.; pl. Bosses (-[e^]z). [OE. boce,
   bose, boche, OF. boce, boche, bosse, F. bosse, of G. origin;
   cf. OHG. b[=o]zo tuft, bunch, OHG. b[=o]zan, MHG. b[^o]zen,
   to beat. See Beat, and cf. Botch a swelling.]
   1. Any protuberant part; a round, swelling part or body; a
      knoblike process; as, a boss of wood.
      [1913 Webster]

   2. A protuberant ornament on any work, either of different
      material from that of the work or of the same, as upon a
      buckler or bridle; a stud; a knob; the central projection
      of a shield. See Umbilicus.
      [1913 Webster]

   3. (Arch.) A projecting ornament placed at the intersection
      of the ribs of ceilings, whether vaulted or flat, and in
      other situations.
      [1913 Webster]

   4. [Cf. D. bus box, Dan. b["o]sse.] A wooden vessel for the
      mortar used in tiling or masonry, hung by a hook from the
      laths, or from the rounds of a ladder. --Gwilt.
      [1913 Webster]

   5. (Mech.)
      (a) The enlarged part of a shaft, on which a wheel is
          keyed, or at the end, where it is coupled to another.
      (b) A swage or die used for shaping metals.
          [1913 Webster]

   6. A head or reservoir of water. [Obs.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

boss
    adj 1: exceptionally good; "a boss hand at carpentry"; "his brag
           cornfield" [syn: boss, brag]
    n 1: a person who exercises control over workers; "if you want
         to leave early you have to ask the foreman" [syn:
         foreman, chief, gaffer, honcho, boss]
    2: a person responsible for hiring workers; "the boss hired
       three more men for the new job" [syn: boss, hirer]
    3: a person who exercises control and makes decisions; "he is
       his own boss now"
    4: a leader in a political party who controls votes and dictates
       appointments; "party bosses have a reputation for corruption"
       [syn: party boss, political boss, boss]
    5: a circular rounded projection or protuberance [syn: knob,
       boss]
    v 1: raise in a relief; "embossed stationery" [syn: emboss,
         boss, stamp]

The Free On-line Dictionary of Computing (19 January 2023):

BOSS

   Bridgport Operating System Software.  A derivative of the ISO
   1054 numerical machine control language for milling, etc.