noun

• The act of flowing or proceeding (of something, quality, or feeling) from a source or origin.
• That which issues, flows, or proceeds from any object as a source; efflux; an effluence.
• (uncountable, obsolete, physics, chemistry) The element radon (Rn)
• (theology) The generation of the Son and the procession of the Holy Spirit, as distinct from the origination of created beings.