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."