Definitions for "Proleptic"
Of or pertaining to prolepsis; anticipative.
Anticipating the usual time; -- applied to a periodical disease whose paroxysms return at an earlier hour at every repetition.
Pertaining to the anticipation of something in the future as already achieved or existing to some degree in the present, e.g. the reign of God, which is to come to its fulfilment in the future, already exists as a reality in the present.
A Proleptic calendar or era is that calendar extrapolated to dates prior to its first adoption. For example, the Battle of Hastings was fought on October 14, 1066, according to the Julian calendar in use at the time. One could also refer to it by the proleptic Gregorian date of October 8, even though the Gregorian calendar was not actually adopted in England until 1752.
Keywords:  antecedent, previous
Previous; antecedent.