The Collaborative International Dictionary of English v.0.48:

Heretofore \Here`to*fore"\, adv.
   Up to this time; hitherto; before; in time past. --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

heretofore
    adv 1: used in negative statement to describe a situation that
           has existed up to this point or up to the present time;
           "So far he hasn't called"; "the sun isn't up yet" [syn:
           so far, thus far, up to now, hitherto,
           heretofore, as yet, yet, til now, until now]

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "heretofore":
   aforetime, already, as yet, before, before all, before now,
   beforetime, by this time, earlier, early, ere, ere then, erenow,
   erewhile, erst, erstwhile, formerly, hereunto, historically,
   hitherto, in the past, in times past, once, only yesterday,
   or ever, prehistorically, previously, priorly, recently, so far,
   still, then, then as previously, theretofore, thus far, till now,
   to date, to this day, until now, until this time, up to now,
   whilom, yesterday, yet