Not to be contentious or even grammar police-like, but the word "for" actually has a few meanings, depending on its function in the sentence.
As a conjunction, it does mean the same as because or since.
As a preposition, it had different meanings that are somewhat similar but not the same. Here is a copy and paste, rather than just typing it out (it's still early, first day back at school and I'm tired ...although by the time I finished typing out my
"reasons" I could have typed out the definitions, no? snicker).
with the object or purpose of:
to run for exercise.
intended to belong to, or be used in connectionwith: equipment for the army;
a closet for dishes.
suiting the purposes or needs of:
medicine for the aged.
in order to obtain, gain, or acquire: a suit foralimony;
to work for wages.
(used to express a wish, as of something to beexperienced or obtained):
O, for a cold drink!
sensitive or responsive to:
an eye for beauty.
desirous of: a longing for something;
a taste for fancy clothes.