Definition of “annihilate” - English Dictionary

“annihilate” in British English

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annihilateverb [ T ]

uk /əˈnaɪ.ə.leɪt/ us /əˈnaɪ.ə.leɪt/
noun [ U ] uk /əˌnaɪ.əˈleɪ.ʃən/ us /əˌnaɪ.əˈleɪ.ʃən/

During the Cold War the threat of nuclear annihilation was always on people's minds.
informal The opposition party's candidate suffered annihilation (= complete defeat) at the polls.

(Definition of “annihilate” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“annihilate” in American English

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annihilateverb [ T ]

us /əˈnɑɪ·əˌleɪt/

to destroy completely, leaving nothing:

The approaching tornado was annihilating everything in its path.
noun [ U ] us /əˌnɑɪ·əˈleɪ·ʃən/

The annihilation of smallpox is a triumph of medicine.

(Definition of “annihilate” from the Cambridge Academic Content Dictionary © Cambridge University Press)