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category
noun
-
category
,
categories
a
group
or
class
of
people
or
things
that
share
the
same
main
qualities
•
Books
for
young
children
belong
in
a
different
category
from
novels
for
adults
.
Books
for
young
children
belong
in
a
different
category
from
novels
for
adults
.
•
The
talent
show
will
have
separate
categories
for
singing
,
dancing
,
and
comedy
.
The
talent
show
will
have
separate
categories
for
singing
,
dancing
,
and
comedy
.
Borrowed
from
late
Latin
categoria
,
from
Greek
katēgoria
meaning
‘
statement
,
classification
’.
The
everyday
sense
of
‘
class
or
group
’
dates
from
the
17th
century
.
noun
-
category
,
categories
in
philosophy
or
logic
,
one
of
the
most
basic
kinds
into
which
things
or
ideas
can
be
sorted
•
Aristotle
proposed
ten
basic
categories
of
being
.
Aristotle
proposed
ten
basic
categories
of
being
.
•
The
lecturer
placed
space
and
time
in
the
same
category
of
experience
.
The
lecturer
placed
space
and
time
in
the
same
category
of
experience
.
The
philosophical
sense
dates
back
to
Aristotle
’
s
Greek
writings
(
4th
century
BC
),
later
adopted
into
Latin
as
categoria
and
re-introduced
into
English
scholarly
language
in
the
late
Middle
Ages
.
noun
-
category
,
categories
in
mathematics
(
category
theory
),
a
collection
of
objects
and
arrows
(
morphisms
)
between
them
that
obey
specific
composition
and
identity
rules
•
A
category
consists
of
objects
like
groups
and
morphisms
like
homomorphisms
.
A
category
consists
of
objects
like
groups
and
morphisms
like
homomorphisms
.
•
Functors
map
one
category
to
another
while
preserving
structure
.
Functors
map
one
category
to
another
while
preserving
structure
.
The
mathematical
sense
was
introduced
in
the
1940s
by
Samuel
Eilenberg
and
Saunders
Mac
Lane
,
who
chose
the
existing
word
"
category
"
to
name
the
abstract
structure
central
to
category
theory
.