Definition of atrocity in English:
atrocity
Line breaks: atro¦city
Pronunciation: /əˈtrɒsɪti /
NOUN (plural atrocities)

1An extremely wicked or cruel act, typically one involving physical violence or injury:
a textbook which detailed war atrocities

SYNONYMS
act of barbarity, act of brutality, act of savagery, act of wickedness, cruelty, abomination, enormity, outrage, horror, monstrosity, obscenity, iniquity, violation, crime, transgression, wrong, wrongdoing, offence, injury, affront, scandal, injustice, abuse; Law malfeasance, tort
View synonyms
barbarity, barbarism, brutality, savagery, inhumanity, cruelty, wickedness, badness, baseness, evil, iniquity, horror, heinousness, villainy, lawlessness, crime, transgression, wrong, wrongdoing, injustice, abuse; Law malfeasance
RARE malefaction

http://www.oxforddictionaries.com/definition/english/atrocity