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Diary of a Teacher in Poland [181]
It's standard educated colloquial English
It isn't colloquial in mainstream UK English. As I say, check CELEX for the frequency - you'll find it's quite lower than the alternatives
Maybe this is a national difference with 'seldom' being more common in the US than in other varieties?
This is possible. In the UK it would come across as older, posher, whiter and more likely to be written than spoken.
I say 'albeit' pretty normally and don't think of it as especially rarified (hitherto is another kettle of fish
Same here, Albeit is OK, hitherto is a bit like seldom.