yet 
(yĕt)
(yĕt)adv.
1. At this time; for the present: isn't ready yet.
2. Up to a specified time; thus far: The end had not yet come.
3. At a future time; eventually: may yet change his mind.
4. Besides; in addition: returned for yet another helping.
5. Still more; even: a yet sadder tale.
6. Nevertheless: young yet wise.
conj.
Idiom: And despite this; nevertheless: She said she would be late, yet she arrived on time.
as yet
Up to the present time; up to now.
[Middle English, from Old English gīet; see i- in the Appendix of Indo-European roots.]