Plural of contamination; instances or cases of something becoming unclean or impure through the introduction of unwanted substances.
From contaminate + -tion (Latin suffix forming nouns of action or state), creating the noun form contamination, with -s for plural. The chain is: Latin contaminare → contamination → contaminations.
Medical professionals track contaminations meticulously because a single contamination event in a hospital can spread to patients, creating outbreaks that kill dozens—prevention is literally a life-and-death issue.
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