enquire [ınˈkwaıə US -ˈkwaır] v [I and T] formal
[Date: 1200-1300; : Old French; Origin: enquerre, from Latin inquirere, from quaerere 'to look for']
to ask someone for information
'Why are you doing that?' the boy inquired.
inquire about
I am writing to inquire about your advertisement in The Times.
inquire whether/why/how etc
The waiter inquired whether we would like to sit near the window.
inquire sth of sb
'Where's the station?' she inquired of a passer-by.
Toby would have liked to inquire further (=ask more questions) .
I did not inquire the reason for his lateness.
>inquirer n
inquire after / [inquire after sb/sth] phr v
to ask about someone's health, what they are doing etc
He called me aside to inquire after my daughter.
inquire into [inquire into sth] phr v
to ask questions in order to get more information about something
The investigation will inquire into the company's financial dealings.

Dictionary of contemporary English. 2013.