(1):

(a.) Exhibited at divers times or in various ways; - used to qualify nouns in the singular number.

(2):

(n.) A copy of a writing made by the manifold process.

(3):

(n.) A cylindrical pipe fitting, having a number of lateral outlets, for connecting one pipe with several others.

(4):

(a.) Various in kind or quality; many in number; numerous; multiplied; complicated.

(5):

(v. t.) To take copies of by the process of manifold writing; as, to manifold a letter.

(6):

(n.) The third stomach of a ruminant animal.