The process or act of removing oxygen from something, or the state of having oxygen removed.
From deoxygenate + -tion (noun suffix forming abstract nouns). The -tion suffix comes from Latin and creates nouns from verbs.
Ocean deoxygenation caused by global warming and pollution is one of the biggest hidden threats to sea life—while everyone talks about coral bleaching, billions of fish are being suffocated by expanding dead zones.
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