What does whilst mean?

[Slawa]

English Language Tests, Intermediate level

ESL/EFL Test #161 "Mobile telecommunication expressions", question 2

It is ......... for drivers to exercise proper control of their vehicle at all times whilst using the mobile phone.

(a) irrelevant
(b) illegal
(c) imperative
(d) inconsequential

English Language Tests, Intermediate level

ESL/EFL Test #161 "Mobile telecommunication expressions", answer 2

It is imperative for drivers to exercise proper control of their vehicle at all times whilst using the mobile phone.

Correct answer: (c) imperative

Your answer was: incorrect
It is irrelevant for drivers to exercise proper control of their vehicle at all times whilst using the mobile phone.
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What it's mean whilst. I couldn't find it in my dictionary. Maybe it supposed to be while?

Thanks.
Slawa

[Alan]

Hi,

It is an older form of 'while'.

Alan
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English as a Second Language
You can read my ESL story Relative Pronoun