Any from a set of copies or repetitions, especially of a laboratory or research procedure.
To make an exact copy; to duplicate; to reproduce
(2) (botany) Folded or bent back on itself, as in a leaf
In genetics, to replicate means to reproduce an exact copy of the genetic material prior to mitosis (or meiosis) in eukaryotic cells. In prokaryotic cells, it is the means by which genetic materials are produced for reproduction.
In scientific experiments, a replicate pertains to a copy or a representative from a group to undergo the same (exact) procedure. For instance, the treatment group would consist of three replicates (called triplicates) to test for the deviation of the results.