Akademik

as yet
adverb
used in negative statement to describe a situation that has existed up to this point or up to the present time (Freq. 9)
-

So far he hasn't called

-

the sun isn't up yet

Syn:
so far, ↑thus far, ↑up to now, ↑hitherto, ↑heretofore, ↑yet, ↑til now, ↑until now

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SO FAR, thus far, yet, still, up till now, up to now.
as

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adverb
: up to the present time : so far

he has not as yet arrived

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as yet
1. Up to the moment
2. Until now (also as-yet)
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Main Entry:as
————————
as yet
Up to the time under consideration
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Main Entry:yet

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I
[usu. with negative] until now or a particular time in the past

the damage is as yet undetermined

II
see as I

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as yet (also as of yet)
: until the present time : so far

He has not as yet heard the result. = As yet he has not heard the result. [=he has not yet heard the result]

• • •
Main Entry:yet

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as ˈyet idiom
until now or until a particular time in the past

an as yet unpublished report

As yet little was known of the causes of the disease.

Main entry:yetidiom

Useful english dictionary. 2012.