Āsava is a Pali term (Sanskrit: Āśrava) that is used in Buddhist scripture, philosophy, and psychology. The glossary of the Companion Encyclopedia of Asian Philosophy defines āsava/āśrava as:
"inflow, influx, influence; mental bias or canker, cankers that keep one bound to the world of samsāra; used particularly in Jainism and Buddhism."
According to De Silva:
"The āsavas which are mentioned frequently are kāmāsava, bhavāsava, diṭṭhāsava and avijjāsava. Horner translates these as the cankers of sense-pleasure, becoming, false views and ignorance. The word canker suggests something that corrodes or corrupts slowly. These figurative meanings perhaps describe facets of the concept of āsava: kept long in storage, oozing out, taint, corroding, etc."