The Collaborative International Dictionary of English v.0.48:

Cohesive \Co*he"sive\, a.
   1. Holding the particles of a homogeneous body together; as,
      cohesive attraction; producing cohesion; as, a cohesive
      force.
      [1913 Webster]

   2. Cohering, or sticking together, as in a mass; capable of
      cohering; tending to cohere; as, cohesive clay.
      [1913 Webster]

   Cohesive attraction. See under Attraction. --
      Co*he"sive*ly, adv. -- Co*he"sive*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

cohesiveness
    n 1: the state of cohering or sticking together [syn:
         coherence, coherency, cohesion, cohesiveness] [ant:
         incoherence, incoherency]
    2: the property of being cohesive and sticky [syn:
       cohesiveness, glueyness, gluiness, gumminess,
       tackiness, ropiness, viscidity, viscidness]