(1):

(n.) The act of pouring out; as, effusion of water, of blood, of grace, of words, and the like.

(2):

(n.) The escape of a fluid out of its natural vessel, either by rupture of the vessel, or by exudation through its walls. It may pass into the substance of an organ, or issue upon a free surface.

(3):

(n.) That which is poured out, literally or figuratively.

(4):

(n.) The liquid escaping or exuded.