Choose the perfect synonym or antonym for the word

Whilst

/waɪlst/

A term used to indicate something taking place at the same time as something else.

Synonyms:

And the bell sounded again, whilst Fouquet repeated, "Gourville!

My servants will see to your needs whilst I am absent."

I did so, whilst the little man stood in the doorway.

Derived from Old English hwil, meaning "a period of time," and the suffix st, indicating simultaneity. Became prevalent in Middle English.

15 mentions per 1 million words

Moderate

Hint: Frequency according to COCA