When you use "from the turn of the decade", that means from
Or is it also OK to use the "decade" for the middle number like
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A decade means a time period of 10 years. You could say something like:
I quit that job last decade.
Now this is 2016, you actually quit the job in 2009. Technically it was just 7 years ago. But you can still say it that way. But you cannot refer '2003-2010' as a decade because that's only 7 years. However, say you were a vegetarian and you quit meat in 2003 and that went on till 2010. Now, you could say that:
I was a vegetarian last decade.
That doesn't mean you were a vegetarian for 10 years. So that is okay. But you cannot refer 7 years as a decade. Hope this helped.
The turn of a [timespan] means the time around the point where one named [timespan] "turns" into another named [timespan].
It's ordinarily used with centuries: the turn of the 20th century is the time around the point where the 19th century ended and the 20th century began. A turn of a decade would work the same way: the turn of the 1990s would be the time around the point where the 1980s ended and the 1990s began.
But the phrase isn't used for random points in time: just for points where generally recognized names change.
I Do not agree that the decade ended at 0h00 on 31 December 2019; In my humble opinion, the decade started 1 January 2011 and will continue until 31 December 2020; If we go back to the terms acronyms BC and AC, it implies that the 1st decade started in year 1 until year 10; and the 2nd decade started from year 11 until year 20; Fast forward to the current Decade, It therefore stands to reason that the current decade started on 1 January 2011 and will end on 31 December 2020