so far

definition: used in negative statement to describe a situation that has existed up to this point or up to the present time

example:

speech part: adverb

synonyms: yet thus far up to now hitherto heretofore as yet til now until now

definition: used after a superlative

example: this is the best so far

speech part: adverb

synonyms: yet

definition: to the degree or extent that

example:

speech part: adverb

synonyms: insofar in so far to that extent to that degree