backport

Short definition from Wiktionary

Verb

1. 1
   To retroactively supply (to a previous version of a software product) a fix, or a new feature, at the same time or after supplying it to the current version.
2. 2
   To retroactively supply (a fix or a new feature) to a previous version of a software product at the same time or after supplying it to the current version.
3. 3
   To re-release software on its original or a previous platform with new features, after its release on a different platform.

Noun

1. 1
   An act of backporting.
2. 2
   A software program that has been backported.