yet
adverb
jet 
jet 
1 used in negative sentences and questions to talk about something that has not happened but that you expect to happen: (British English) I haven't received a letter from him yet. (North American English) I didn't receive a letter from him yet.‘Are you ready?’ ‘No, not yet.’We have yet to decide what action to take (= We have not decided what action to take).2 (used in negative sentences) now; as soon as thisDon't go yet.We don't need to start yet.3 from now until the period of time mentioned has passedHe'll be busy for ages yet.They won't arrive for at least two hours yet.4 could, might, may, etc. do something yet used to say that something could, might, etc. happen in the future, even though it seems unlikelyWe may win yet. (formal) She could yet surprise us all.5 the best, longest, etc. something yet (done) the best, longest, etc. thing of its kind made, produced, written, etc. until now/thenthe most comprehensive study yet of his musicIt was the highest building yet constructed.6 yet another/more| yet again used to emphasize an increase in number or amount or the number of times something happenssnow, snow and yet more snowyet another diet bookPrices were cut yet again (= once more, after many other times).7 yet worse, more importantly, etc. used to emphasize an increase in the degree of something (= how bad, important, etc. it is)Synonym
evenSynonym
stilla recent and yet more improbable theoryIdioms
as yet
until now or until a particular time in the past
an as yet unpublished reportAs yet little was known of the causes of the disease.
Usage note: already / just / yetAlready and yet are usually used with the present perfect tense, but in North American English they can also be used with the simple past tense: I already did it. ◇ Did you eat yet?However, this is much more common in spoken than in written English and some Americans do not consider it acceptable, even in speech. The present perfect is more common in North American English and almost always used in British English: I’ve already done it. ◇ Have you eaten yet?Just is mostly used with the perfect tenses in British English and with the simple past in North American English: I’ve just had some bad news. (British English) ◇ I just got some bad news. (North American English)