- (General American, Received Pronunciation) IPA(key): /waɪlst/, /hwaɪlst/
- (UK) IPA(key): /wʌɪlst/
Audio (UK) (file)
- (Britain, rare or literary in North America) While, at the same time.
- Drivers must switch off engines whilst on stand. ― (instruction on a bus stand sign)
In American English, whilst is considered to be pretentious or archaic. Penguin Working Words recommends while only, and notes that whilst is old-fashioned. Cambridge Guide to English Usage and M-W's Webster's Guide to English Usage comment on its regional character, and note that it is rare in American usage. It is thus safer to use only while in international English. The American Heritage Guide writes that, "while using whilst runs the risk of sounding pretentious, it can sometimes add a literary or ironically formal note to a piece of writing".