The Collaborative International Dictionary of English v.0.48:

Ligature \Lig"a*ture\ (l[i^]g"[.a]*t[-u]r), v. t. (Surg.)
   To ligate; to tie.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ligature \Lig"a*ture\ (l[i^]g"[.a]*t[-u]r; 135), n. [L.
   ligatura, fr. ligare, ligatum, to bind: cf. F. ligature. Cf.
   Ally, League, Legatura, Liable, Ligament.]
   1. The act of binding.
      [1913 Webster]

   2. Anything that binds; a band or bandage.
      [1913 Webster]

   3. (Surg.)
      (a) A thread or string for tying the blood vessels,
          particularly the arteries, to prevent hemorrhage.
      (b) A thread or wire used to remove tumors, etc.
          [1913 Webster]

   4. The state of being bound or stiffened; stiffness; as, the
      ligature of a joint.
      [1913 Webster]

   5. Impotence caused by magic or charms. [Obs.]
      [1913 Webster]

   6. (Mus.) A curve or line connecting notes; a slur.
      [1913 Webster]

   7. (Print.) A double character, or a type consisting of two
      or more letters or characters united, as [ae], [filig],
      [ffllig].
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Logotype \Log"o*type\, n. [Gr. lo`gos word + -type.] (Print.)
   A single type, containing two or more letters; as, [ae],
   \[oe], [AE], [filig], [fllig], [ffllig], etc.; -- called also
   ligature.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ligature
    n 1: (music) a group of notes connected by a slur
    2: character consisting of two or more letters combined into one
    3: a metal band used to attach a reed to the mouthpiece of a
       clarinet or saxophone
    4: thread used by surgeons to bind a vessel (as to constrict the
       flow of blood)
    5: something used to tie or bind [syn: binder, ligature]
    6: the act of tying or binding things together [syn: tying,
       ligature]