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functional
adjective
working
or
able
to
operate
as
intended
•
After
the
storm
,
only
one
functional
flashlight
remained
in
the
house
.
After
the
storm
,
only
one
functional
flashlight
remained
in
the
house
.
•
The
old
printer
is
still
functional
,
so
we
don
’
t
need
a
new
one
yet
.
The
old
printer
is
still
functional
,
so
we
don
’
t
need
a
new
one
yet
.
From
function
+
-al
,
first
recorded
in
the
19th
century
referring
to
things
that
perform
a
function
.
adjective
designed
mainly
for
practical
use
rather
than
for
looks
•
The
apartment
’
s
décor
is
simple
and
functional
,
with
shelves
that
fold
into
the
wall
.
The
apartment
’
s
décor
is
simple
and
functional
,
with
shelves
that
fold
into
the
wall
.
•
She
chose
a
functional
backpack
with
many
pockets
for
her
hiking
trip
.
She
chose
a
functional
backpack
with
many
pockets
for
her
hiking
trip
.
Sense
evolved
in
20th-century
design
movements
that
valued
purpose
over
decoration
.
noun
a
mathematical
rule
that
takes
a
whole
function
as
its
input
and
returns
a
single
number
•
In
calculus
class
,
we
learned
how
a
functional
maps
a
curve
to
a
single
number
.
In
calculus
class
,
we
learned
how
a
functional
maps
a
curve
to
a
single
number
.
•
The
physicist
used
an
energy
functional
to
predict
the
system
’
s
behavior
.
The
physicist
used
an
energy
functional
to
predict
the
system
’
s
behavior
.
Coined
in
the
late
19th
century
from
function
+
-al
to
describe
objects
in
the
calculus
of
variations
.