All 7 Uses

inquiry
in
An Inspector Calls
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One person and one line of inquiry at a time.†
p. 15.3

inquiry = questioning or investigating
And I don't really see that this inquiry gets you anywhere, Inspector.†
p. 19.9
One line of inquiry at a time.†
p. 23.4
Inquiries of this sort, for instance.†
p. 24.1

inquiries = questions or investigations
I realize that you may have to conduct some sort of inquiry, but I must say that so far you seem to be conducting it in a rather peculiar and offensive manner.†
p. 31.9 *

inquiry = questioning or investigating
Inspector, I've told you before, I don't like your tone nor the way you're handling this inquiry.†
p. 33.6
No police inquiry.†
p. 65.2

Definitions:

(1) (inquiry)
a question or investigation -- especially one meant to gather information or find out the truth
(2) (meaning too rare to warrant focus)