pollution

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pollution /pəˈluːʃən/ noun
pollution
/pəˈluːʃən/
noun
Learner's definition of POLLUTION
[noncount]
: the action or process of making land, water, air, etc., dirty and not safe or suitable to use
: substances that make land, water, air, etc., dirty and not safe or suitable to use
see also light pollution, noise pollution