(1):
(v. t.) To divide into two by natural growth or spontaneous action; as, infusoria duplicate themselves.
(2):
(n.) That which exactly resembles or corresponds to something else; another, correspondent to the first; hence, a copy; a transcript; a counterpart.
(3):
(v. t.) To double; to fold; to render double.
(4):
(v. t.) To make a duplicate of (something); to make a copy or transcript of.
(5):
(n.) An original instrument repeated; a document which is the same as another in all essential particulars, and differing from a mere copy in having all the validity of an original.
(6):
(a.) Double; twofold.