The Collaborative International Dictionary of English v.0.48:

Entanglement \En*tan"gle*ment\, n.
   1. State of being entangled; intricate and confused
      involution; that which entangles; intricacy; perplexity.
      [1913 Webster]

   2. (Mil.) An extensive low obstacle formed of stakes, stumps,
      or the like, connected by wires, ropes, or the like.
      [Webster 1913 Suppl.]

   3. (Naut.) An obstruction of cables and spars across a river
      or harbor entrance.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

entanglement
    n 1: an intricate trap that entangles or ensnares its victim
         [syn: web, entanglement]