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whilst

[hwahylst, wahylst] /ʰwaɪlst, waɪlst/
conjunction
1.
Chiefly British, while.
Origin of whilst
1325-1375
1325-75; Middle English whilest, equivalent to whiles + parasitic -t as in amongst, amidst
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for whilst

while

/waɪl/
conjunction
1.
(subordinating) at the same time that: please light the fire while I'm cooking
2.
(subordinating) all the time that: I stay inside while it's raining
3.
(subordinating) in spite of the fact that: while I agree about his brilliance I still think he's rude
4.
(coordinating) whereas; and in contrast: flats are expensive, while houses are cheap
5.
(subordinating; used with a gerund) during the activity of: while walking I often whistle
preposition, conjunction
6.
(Scot & Northern English, dialect) another word for until you'll have to wait while Monday for these sheets, you'll never make any progress while you listen to me
noun
7.
(usually used in adverbial phrases) a period or interval of time: once in a long while
8.
trouble or time (esp in the phrase worth one's while): it's hardly worth your while to begin work today
9.
the while, at that time: he was working the while
See also whiles
Usage note
It was formerly considered incorrect to use while to mean in spite of the fact that or whereas, but these uses have now become acceptable
Word Origin
Old English hwīl; related to Old High German hwīla (German Weile), Gothic hveila, Latin quiēs peace, tranquīlustranquil

whilst

/waɪlst/
conjunction
1.
(mainly Brit) another word for while (sense 1), while (sense 2), while (sense 3), while (sense 4), while (sense 5)
Word Origin
C13: from whiles + -t as in amidst
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for whilst
adv.

late 14c., from while (q.v.) with adverbial genitive -s-, and excrescent -t- (as in amongst, amidst).

Online Etymology Dictionary, © 2010 Douglas Harper
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12
12
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