The Collaborative International Dictionary of English v.0.48:

Watch \Watch\, v. t. [imp. & p. p. Watched; p. pr. & vb. n.
   Watching.]
   [1913 Webster]
   1. To give heed to; to observe the actions or motions of, for
      any purpose; to keep in view; not to lose from sight and
      observation; as, to watch the progress of a bill in the
      legislature.
      [1913 Webster]

            Saul also sent messengers unto David's house to
            watch him, and to slay him.           --1 Sam. xix.
                                                  11
      [1913 Webster]

            I must cool a little, and watch my opportunity.
                                                  --Landor.
      [1913 Webster]

            In lazy mood I watched the little circles die.
                                                  --Longfellow.
      [1913 Webster]

   2. To tend; to guard; to have in keeping.
      [1913 Webster]

            And flaming ministers, to watch and tend
            Their earthy charge.                  --Milton.
      [1913 Webster]

            Paris watched the flocks in the groves of Ida.
                                                  --Broome.
      [1913 Webster]
      [1913 Webster]

WordNet (r) 3.0 (2006):

watching
    n 1: the act of observing; taking a patient look [syn:
         observation, observance, watching]