preposition
Etymology: Middle English, from as + to
: with reference to : in regard to : as regards:
a. : about , concerning , respecting
a matter as to which opinions might differ
stopped short of their objective as to production
felt somewhat at a loss as to how to begin — Life
as to my own views, they will be mentioned later
uncertain as to what to do next
b. : according to : by
classified and graded as to size and color