What is the meaning of yet?

adverb

• Up to the present time.
  • usage: "I have yet to see the results"; "details are yet to be worked out"
• Used in negative statement to describe a situation that has existed up to this point or up to the present time.
  • usage: "So far he hasn't called"; "the sun isn't up yet"
  • synonyms: so far, thus far, up to now, hitherto, heretofore, as yet, til now, until now
• To a greater degree or extent; used with comparisons.
  • usage: "looked sick and felt even worse"; "an even (or still) more interesting problem"; "still another problem must be solved"; "a yet sadder tale"
  • synonyms: even, still
• Within an indefinite time or at an unspecified future time.
  • usage: "he longed for the flowers that were yet to show themselves"; "sooner or later you will have to face the facts"; "in time they came to accept the harsh reality"
  • synonyms: in time
• Used after a superlative.
  • usage: "this is the best so far"; "the largest drug bust yet"
  • synonyms: so far
• Despite anything to the contrary (usually following a concession. )
  • usage: "although I'm a little afraid, however I'd like to try it"; "while we disliked each other, nevertheless we agreed"; "he was a stern yet fair master"; "granted that it is dangerous, all the same I still want to go"
  • synonyms: however, nevertheless, withal, still, all the same, even so, nonetheless, notwithstanding