Definition of "Yet" :
adverb: to a greater degree or extent; used with comparisons
"A yet sadder tale."
adverb: despite anything to the contrary (usually preceding a concession)
"He was a stern yet fair master."
adverb: up to the present time
"I have yet to see the results."
adverb: used in negative statement to describe a situation that has existed up to this point or up to the present time
"The sun isn't up yet."
adverb: used after a superlative
"The largest drug bust yet."
adverb: within an indefinite time or at an unspecified future time
"He longed for the flowers that were yet to show themselves."