What it means

1. adverb up to the present time
   “I have yet to see the results”
2. adverb within an indefinite time or at an unspecified future time
   “he longed for the flowers that were yet to show themselves”
3. adverb to a greater degree or extent
   “looked sick and felt even worse”
4. adverb used after a superlative
   “this is the best so far”
5. adverb despite anything to the contrary (usually preceding a concession)
   “although I'm a little afraid, however I'd like to try it”
6. 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”