Todays current Merriam-Webster's Dictionary offers 10 possible definitions. It is definition #1a that is being used in the verse from Acts.
1
a —used as a function word to indicate
purpose <a grant
for studying medicine>
b —used as a function word to indicate an intended goal <left
for home> <acted
for the best>
c —used as a function word to indicate the object or recipient of a perception, desire, or activity<now
for a good rest> <run
for your life> <an eye
for a bargain>
2
a
: as being or constituting <taken
for a fool> <eggs
for breakfast>
b —used as a function word to indicate an actual or implied enumeration or selection <
for one thing, the price is too high>
3
: because of <can't sleep
for the heat>
4
—used as a function word to indicate suitability or fitness <it is not
for you to choose> <ready
foraction>
5
a
: in place of <go to the store
for me>
b (1)
: on behalf of
: representing <speaks
for the court> (2)
: in favor of <all
for the plan>
6
: in spite of —usually used with
all <
for all his large size, he moves gracefully>
7
: with respect to
: concerning <a stickler
for detail> <heavy
for its size>
8
a —used as a function word to indicate equivalence in exchange <$10
for a hat>, equality in number or quantity <point
for point>, or correspondence or correlation <
for every one that works, you'll find five that don't>
b —used as a function word to indicate number of attempts <0
for 4>
9
—used as a function word to indicate duration of time or extent of space <gone
for two days>
10
: in honor of
: after <named
for her grandmother
