freeze

freeze v.  To lock an evolving software distribution or
   document against changes so it can be released with some hope of
   stability.  Carries the strong implication that the item in
   question will `unfreeze' at some future date.  "OK, fix that
   bug and we'll freeze for release."

   There are more specific constructions on this term.  A `feature
   freeze', for example, locks out modifications intended to introduce
   new features but still allows bugfixes and completion of existing
   features; a `code freeze' connotes no more changes at all.  At
   Sun Microsystems and elsewhere, one may also hear references to
   `code slush' -- that is, an almost-but-not-quite frozen state.