Princeton's WordNet

1. so far, thus far, up to now, hitherto, heretofore, as yet, yet, til now, until now(adverb)

   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"

2. up to now, to date(adverb)

   prior to the present time

   "no suspect has been found to date"