Source : Webster's Revised Unabridged Dictionary (1913)

Observe \Ob*serve"\, v. t. [imp. & p. p. {Observed}; p. pr. &
   vb. n. {Observing}.] [L. observare, observatum; ob (see
   {Ob-}) + servare to save, preserve, keep, heed, observe:
   cf.F. observer. See {Serve}.]
   1. To take notice of by appropriate conduct; to conform one's
      action or practice to; to keep; to heed; to obey; to
      comply with; as, to observe rules or commands; to observe
      civility.

            Ye shall observe the feast of unleavened bread.
                                                  --Ex. xii. 17.

            He wolde no such cursedness observe.  --Chaucer.

            Must I budge? Must I observe you?     --Shak.

            With solemn purpose to observe Immutably his
            sovereign will.                       --Milton.

   2. To be on the watch respecting; to pay attention to; to
      notice with care; to see; to perceive; to discover; as, to
      observe an eclipse; to observe the color or fashion of a
      dress; to observe the movements of an army.

   3. To express as what has been noticed; to utter as a remark;
      to say in a casual or incidental way; to remark.

Source : WordNet®

observed
     adj : discovered or determined by scientific observation;
           "variation in the ascertained flux depends on a number
           of factors"; "the discovered behavior norms";
           "discovered differences in achievement"; "no
           explanation for the observed phenomena" [syn: {ascertained},
            {discovered}]