/ hɒˈstɪləti; NAmE hɑːˈs-/ noun
1.
[ U ] hostility (to / towards sb/sth) unfriendly or aggressive feelings or behaviour :
feelings of hostility towards people from other backgrounds
There was open hostility between the two schools.
2.
[ U ] hostility (to / towards sth) strong and angry opposition towards an idea, a plan or a situation :
public hostility to nuclear power
3.
hostilities [ pl. ] ( formal ) acts of fighting in a war :
the start / outbreak of hostilities between the two sides
a cessation of hostilities (= an end to fighting)
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WORD ORIGIN
late Middle English : from French hostilité or late Latin hostilitas , from Latin hostilis , from hostis stranger, enemy.