Amongst, Whilst, Betwixt

Amongst is an alternate form of among.  Whilst is an alternate form of while.  Betwixt can be used as an alternate form of between, although it is more commonly seen in a certain idiom.  "Betwixt and between" means "neither one nor the other."

 

Amongst, whilst, and betwixt are common in British and Australian English but very rare in American and Canadian English.

 

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