Definitions
1.NounAn early registration, before the normal or traditional time, as with early online check-in at hotels.
2.NounRegistration (of a study design) before a clinical trial (or any other type of scientific experiment) begins, for methodologic and thus epistemologic rigor.
3.AdjectiveBefore registration."a preregistration check"
4.AdjectivePertaining to preregistration (of scientific trials or other experiments).