Deprecation Policy
As RETRO evolves, some words will become obsolete and no longer
be needed. In each release, these will be marked as deprecated
in the glossary. Any deprecated words will be removed in the
next quarterly release.
E.g., if 2020.1 had deprecated words, these would be removed in
the 2020.4 release. Any words made deprecated in between 2020.1
and 2020.4 would be removed in the 2020.7 release.