manifold

(noun) a pipe that has several lateral outlets to or from other pipes.

(noun) a lightweight paper used with carbon paper to make multiple copies. Synonyms: manifold paper. Example: "An original and two manifolds."

(noun) a set of points such as those of a closed surface or an analogue in three or more dimensions.

(verb) make multiple copies of. Example: "Multiply a letter."

(verb) combine or increase by multiplication. Synonyms: multiply. Example: "He managed to multiply his profits."

(adj) many and varied; having many features or forms. Synonyms: multiplex. Examples: "Manifold reasons." "Our manifold failings." "Manifold intelligence." "The multiplex opportunities in high technology."