adverb
at what time
at, in, or during which
at or during which time
informal :at a former and usually less successful time
conjunction
at or during the time that
just after the time that
at any or every time that
a - used to say what happens, is true, or can be done in a particular situation
b - used to ask why or how something is done in the situation that exists
in spite of the fact that :although
the time or occasion at or in which
pronoun
what or which time
since when?
US