1. (adverb)so far, thus far, up to now, hitherto, heretofore, as yet, yet, til now, until now used in negativestatement to describe a situation that has existed up to this point or up to the presenttime "So far he hasn't called"; "the sun isn't up yet"
2. (adverb)insofar, in so far, so far, to that extent, to that degree to the degree or extent that "insofar as it can be ascertained, the horse lung is comparable to that of man"; "so far as it is reasonably practical he should practice restraint"
3. (adverb)so far, yet used after a superlative "this is the best so far"; "the largest drug bust yet"