the act of making copies

(genetics) the process whereby DNA makes a copy of itself before cell division

a quick reply to a question or remark (especially a witty or critical one)

(law) a pleading made by a plaintiff in reply to the defendant's plea or answer

the repetition of a sound resulting from reflection of the sound waves

copy that is not the original; something that has been copied

the repetition of an experiment in order to test the validity of its conclusion