Noun
The
branch
of
philosophy
dealing with
the
study
of
knowledge
;
the
theory
of
knowledge
,
asking
such
questions
as
"
What
is
knowledge
?", "
How
is
knowledge
acquired
?", "
What
do
people
know
?", "
How
do
we
know
what
we
know
?", "
How
do
we
know
it
is
true
?",
and
so
on
.