Definition of "seepage" [seep•age]

• The act or process of seeping. (noun)
• A quantity of something that has seeped. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "This is why the La Brea tar pits exist and have existed since prehistoric times – the tar is seepage from a vast subduction zone."
• "Any mercury underground at Pozos must have arrived there through seepage from the surface, or inadvertant transport on descending miners ..."
• "The combination of newsprint for absorbency and glossy paper supplements to prevent seepage is unbeatable."