(1):

(v. t.) To multiply; to make manifold.

(2):

(v. i.) To hold more than one benefice at the same time.

(3):

(v. i.) To take a plural; to assume a plural form; as, a noun pluralizes.

(4):

(v. t.) To make plural by using the plural termination; to attribute plurality to; to express in the plural form.