Source : Webster's Revised Unabridged Dictionary (1913)

Peace \Peace\, n. [OE. pees, pais, OF. pais, paiz, pes, F. paix,
   L. pax, pacis, akin to pacere, paciscere, pacisci, to make an
   agreement, and prob. also pangere to fasten. Cf. {Appease},
   {Fair}, a., {Fay}, v., {Fang}, {Pacify}, {Pact}, {Pay} to
   requite.]
   A state of quiet or tranquillity; freedom from disturbance or
   agitation; calm; repose; specifically:
   (a) Exemption from, or cessation of, war with public enemies.
   (b) Public quiet, order, and contentment in obedience to law.
   (c) Exemption from, or subjection of, agitating passions;
       tranquillity of mind or conscience.
   (d) Reconciliation; agreement after variance; harmony;
       concord. ``The eternal love and pees.'' --Chaucer.

   Note: Peace is sometimes used as an exclamation in commanding
         silence, quiet, or order. ``Peace! foolish woman.''
         --Shak.

   {At peace}, in a state of peace.

   {Breach of the peace}. See under {Breach}.

   {Justice of the peace}. See under {Justice}.

   {Peace of God}. (Law)
   (a) A term used in wills, indictments, etc., as denoting a
       state of peace and good conduct.
   (b) (Theol.) The peace of heart which is the gift of God.

   {Peace offering}.
   (a) (Jewish Antiq.) A voluntary offering to God in token of
       devout homage and of a sense of friendly communion with
       Him.
   (b) A gift or service offered as satisfaction to an offended
       person.

   {Peace officer}, a civil officer whose duty it is to preserve
      the public peace, to prevent riots, etc., as a sheriff or
      constable.

   {To hold one's peace}, to be silent; to refrain from
      speaking.

   {To make one's peace with}, to reconcile one with, to plead
      one's cause with, or to become reconciled with, another.
      ``I will make your peace with him.'' --Shak.

Source : WordNet®

at peace
     adj : dead; "he is deceased"; "our dear departed friend" [syn: {asleep(p)},
            {at peace(p)}, {at rest(p)}, {deceased}, {departed}, {gone}]