characterized by peace; free from war, strife, commotion, violence, or disorder: a peaceful reign; a peaceful demonstration.
of, pertaining to, or characteristic of a state or time of peace.
peaceable; not argumentative, quarrelsome, or hostile: a peaceful disposition.

1250–1300; Middle English pesful. See peace, -ful

peacefully, adverb
peacefulness, noun
quasi-peaceful, adjective
quasi-peacefully, adverb
semipeaceful, adjective
semipeacefully, adverb
unpeaceful, adjective
unpeacefully, adverb

peaceable, peaceful (see synonym study at the current entry).

1. Peaceful, placid, serene, tranquil refer to what is characterized by lack of strife or agitation. Peaceful today is rarely applied to persons; it refers to situations, scenes, and activities free of disturbances or, occasionally, of warfare: a peaceful life. Placid, serene, tranquil are used mainly of persons; when used of things (usually elements of nature) there is a touch of personification. Placid suggests an unruffled calm that verges on complacency: a placid disposition; a placid stream. Serene is a somewhat nobler word; when used of persons it suggests dignity, composure, and graciousness: a serene old man; when applied to nature there is a suggestion of mellowness: the serene landscapes of autumn. Tranquil implies a command of emotions, often because of strong faith, which keeps one unagitated even in the midst of excitement or danger. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
peaceful (ˈpiːsfʊl)
1.  not in a state of war or disagreement
2.  tranquil; calm
3.  not involving violence: peaceful picketing
4.  of, relating to, or in accord with a time of peace: peaceful uses of atomic energy
5.  inclined towards peace

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, "inclined to peace, friendly," from peace + -ful. Meaning "tranquil, calm" is from mid-14c. In reference to nonviolent methods of effecting social change, it is attested from 1876. Peaceful coexistence (1920) originally was in regard to Soviet policy toward the capitalist West.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
She's the world's best car traveler, content to sit peacefully in the backseat
  looking around at the world whizzing by her.
Perhaps now,so many years later the spirits of those perished so long ago,can
  finally rest peacefully in their eternal slumber.
Hopefully, things will turn positive and you will get your point across
  peacefully and without pain.
Pushy, know-it-all busybodies who cannot manage to peacefully convince others.
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