Etymology
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asphyxiation (n.)

"act of causing asphyxia," 1849, noun of action from asphyxiate (v.).

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Definitions of asphyxiation

asphyxiation (n.)
the condition of being deprived of oxygen (as by having breathing stopped);
asphyxiation is sometimes used as a form of torture
Synonyms: suffocation
asphyxiation (n.)
killing by depriving of oxygen;
Synonyms: suffocation
From wordnet.princeton.edu