An Etymological Dictionary of Astronomy and Astrophysics

1. The act of reproducing or the condition or process of being reproduced.
   

   2. Something reproduced, especially in the faithfulness of its resemblance to the form and elements of the original.
      

   3. Biology: Any of various processes, either sexual or asexual, by which an animal or plant produces one or more individuals similar to itself (TheFreeDictionary.com).

See also: → reproduce; → -tion.