Word Study
til now
WORDNET DICTIONARY
Adverbial til now has 1 sense
- til now(r = adv.all) as yet, heretofore, hitherto, so far, thus far, until now, up to now, yet - used in negative statement to describe a situation that has existed up to this point or up to the present time; "So far he hasn't called"; "the sun isn't up yet"
For further exploring for "til now" in Webster Dictionary Online