Meaning of “lethal” in the English Dictionary

"lethal" in British English

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lethaladjective

uk /ˈliː.θəl/ us /ˈliː.θəl/

C2 able to cause or causing death; extremely dangerous:

Three minutes after the fire started, the house was full of lethal fumes.
In the car the police found guns, knives, and other lethal weapons (= weapons that can kill).
A 59-year-old man was executed by lethal injection (= by having a poisonous substance put into his body) this morning.
informal That combination of tiredness and alcohol is lethal (= has a very bad effect).
lethally
adverb uk /ˈliː.θəl.i/ us /ˈliː.θəl.i/

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

"lethal" in American English

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lethaladjective

us /ˈli·θəl/

able to cause or causing death; extremely dangerous:

a lethal weapon

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