noun
the condition of being deprived of oxygen, leading to unconsciousness or death
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The cause of death was determined to be asphyxiation due to lack of oxygen.
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He almost passed out from laughing so hard, it felt like asphyxiation.
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I was so scared in that haunted house, I thought I was gonna die of asphyxiation!
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The strict rules and regulations felt like a form of mental asphyxiation.