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infiltration [infiltrations]▼(act or process of infiltrating)noun[UK: ˌɪn.fɪl.ˈtreɪʃ.n̩] [US: ˌɪn.fəl.ˈtreɪʃ.n̩]
percolation [percolations]▼(seepage or filtration of a liquid)noun[UK: ˈpɜːk.ə.leɪʃ.n̩] [US: ˈpɝːk.ə.leɪʃ.n̩]
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