yet (adv.)

Old English get, gieta "till now, thus far, earlier, at last, also," an Anglo-Frisian word (cognates: Old Frisian ieta, Middle High German ieuzo), of unknown origin; perhaps connected to PIE pronominal stem *i- (see yon). The meaning in other Germanic languages is expressed by descendants of Proto-Germanic *noh- (source of German noch), from PIE *nu-qe- "and now." As a conjunction from c. 1200.

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Definitions of yet from WordNet

yet (adv.)
up to the present time;
I have yet to see the results
details are yet to be worked out
yet (adv.)
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
Synonyms: so far / thus far / up to now / hitherto / heretofore / as yet / til now / until now
yet (adv.)
to a greater degree or extent; used with comparisons;
a yet sadder tale
Synonyms: even / still
yet (adv.)
within an indefinite time or at an unspecified future time;
he longed for the flowers that were yet to show themselves
Synonyms: in time
yet (adv.)
used after a superlative;
the largest drug bust yet
Synonyms: so far
yet (adv.)
despite anything to the contrary (usually preceding a concession);
he was a stern yet fair master
Synonyms: however / nevertheless / withal / still / all the same / even so / nonetheless / notwithstanding / at the same time