vb, -cat*ed  -cat*ing vt  :  to repeat or duplicate (as an experiment) vi  :  to undergo replication  :  produce a replica of itself <virus particles replicating in cells> 
, n 1  :  one of several identical experiments, procedures, or samples  2  :  something (as a gene, DNA, or a cell) produced by replication .
 
 
 
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