The Collaborative International Dictionary of English v.0.48:

departed \departed\ adj.
   1. past; -- used of time; as, departed summers.

   Syn: bygone, bypast, foregone, gone.
        [WordNet 1.5 +PJC]

   2. dead; as, our dear departed parents. [euphemistic]

   Syn: asleep(predicate), at peace(predicate), at
        rest(predicate), cold, deceased, gone.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Depart \De*part"\, v. i. [imp. & p. p. Departed; p. pr. & vb.
   n. Departing.] [OE. departen to divide, part, depart, F.
   d['e]partir to divide, distribute, se d['e]partir to separate
   one's self, depart; pref. d['e]- (L. de) + partir to part,
   depart, fr. L. partire, partiri, to divide, fr. pars part.
   See Part.]
   1. To part; to divide; to separate. [Obs.] --Shak.
      [1913 Webster]

   2. To go forth or away; to quit, leave, or separate, as from
      a place or a person; to withdraw; -- opposed to arrive; --
      often with from before the place, person, or thing left,
      and for or to before the destination.
      [1913 Webster]

            I will depart to mine own land.       --Num. x. 30.
      [1913 Webster]

            Ere thou from hence depart.           --Milton.
      [1913 Webster]

            He which hath no stomach to this fight,
            Let him depart.                       --Shak.
      [1913 Webster]

   3. To forsake; to abandon; to desist or deviate (from); not
      to adhere to; -- with from; as, we can not depart from our
      rules; to depart from a title or defense in legal
      pleading.
      [1913 Webster]

            If the plan of the convention be found to depart
            from republican principles.           --Madison.
      [1913 Webster]

   4. To pass away; to perish.
      [1913 Webster]

            The glory is departed from Israel.    --1 Sam. iv.
                                                  21.
      [1913 Webster]

   5. To quit this world; to die.
      [1913 Webster]

            Lord, now lettest thou thy servant depart in peace.
                                                  --Luke ii. 29.
      [1913 Webster]

   To depart with, to resign; to part with. [Obs.] --Shak.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

departed \departed\ n. sing. & pl.
   someone who is no longer alive; as, let us pray for the
   departed.

   Syn: dead person, dead soul, deceased person, deceased,
        decedent.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

departed
    adj 1: well in the past; former; "bygone days"; "dreams of
           foregone times"; "sweet memories of gone summers";
           "relics of a departed era" [syn: bygone, bypast,
           departed, foregone, gone]
    2: dead; "he is deceased"; "our dear departed friend" [syn:
       asleep(p), at peace(p), at rest(p), deceased,
       departed, gone]
    n 1: someone who is no longer alive; "I wonder what the dead
         person would have done" [syn: dead person, dead soul,
         deceased person, deceased, decedent, departed]