[1] : The Collaborative International Dictionary of English v.0.48

observe \observe"\ o^bz~erv", v. t. imp.  p. p.
   observed o^bz~ervd"; 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.
      1913 webster

            ye shall observe the feast of unleavened bread.
                                                  --ex. xii. 17.
      1913 webster

            he wolde no such cursedness observe.  --chaucer.
      1913 webster

            must i budge? must i observe you?     --shak.
      1913 webster

            with solemn purpose to observe
            immutably his sovereign will.         --milton.
      1913 webster

   2. to be on the watch respecting; to pay attention to; to
      notice with care; to see; to perceive; to notice; to
      discover; as, to observe an eclipse; to observe the color
      or fashion of a dress; to observe the movements of an
      army; to observe an accident.
      1913 webster +pjc

   3. to express as what has been noticed; to utter as a remark;
      to say in a casual or incidental way; to remark.
      1913 webster
see also:
observed observing ob- serve 

[2] : The Collaborative International Dictionary of English v.0.48

observed \observed\ adj.
   1. perceived with the eyes and sometimes with other senses;
      as, no explanation for the observed phenomena.
      wordnet 1.5

   2. detected by systematic scientific observation; as,
      variation in the observed flux may depend on a number of
      factors.

   syn: ascertained.
        wordnet 1.5

   3. perceived directly with the eyes; observed at first hand.

   syn: seen, witnessed.
        wordnet 1.5

[3] : WordNet (r) 2.0

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
see also:
ascertained discovered 

Observed >> O Words
Observed, definition of term: Observed
observed_pag1.html