WordNet (r) 3.0 (2006):

reuse
    v 1: use again after processing; "We must recycle the cardboard
         boxes" [syn: recycle, reprocess, reuse]

The Free On-line Dictionary of Computing (30 December 2018):

reuse
reusability

   Using code developed for one application program in another
   application.  Traditionally achieved using program libraries.
   Object-oriented programming offers reusability of code via
   its techniques of inheritance and genericity.  Class
   libraries with intelligent browsers and application
   generators are under development to help in this process.
   Polymorphic functional languages also support reusability
   while retaining the benefits of strong typing.

   See also DRAGOON, National Software Reuse Directory,
   RLF.