Definition of seepage noun from the Oxford Advanced Learner's Dictionary

 

seepage

 noun
noun
BrE BrE//ˈsiːpɪdʒ//
 
; NAmE NAmE//ˈsiːpɪdʒ//
 
[uncountable, countable, usually plural]
 
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the process by which a liquid flows slowly and in small quantities through something; the result of this process Water gradually escapes by seepage through the ground. oil seepages (figurative) This new legislation represents a further seepage of power to Brussels.
See the Oxford Advanced American Dictionary entry: seepage