Hi, I never dare use this conjuction because I don't understand it. When I came upon it in a sentence, I could usually guessed the meaning by its association with the rest of the context. But when it stands alone, I'm at a loss.
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CliveI see it as a matter of style. The construction is more literary, and less likely to be used in everyday casual English speech. So, a possible 'connotation' might be that the listener would think the speaker an educated person.
Cliv