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indicator
noun
a
flashing
light
on
a
vehicle
that
shows
it
is
going
to
turn
left
or
right
•
He
forgot
to
switch
off
his
left
indicator
after
turning
the
corner
.
He
forgot
to
switch
off
his
left
indicator
after
turning
the
corner
.
•
The
driver
’
s
right
indicator
was
blinking
as
she
approached
the
roundabout
.
The
driver
’
s
right
indicator
was
blinking
as
she
approached
the
roundabout
.
specialised
motoring
sense
recorded
in
British
English
from
the
1920s
,
from
the
general
noun
'indicator'
noun
something
that
shows
,
points
out
,
or
measures
the
level
,
presence
,
or
change
of
something
•
The
rising
unemployment
rate
is
an
indicator
that
the
economy
is
slowing
down
.
The
rising
unemployment
rate
is
an
indicator
that
the
economy
is
slowing
down
.
•
The
battery
indicator
on
my
phone
turned
red
,
warning
me
to
charge
it
.
The
battery
indicator
on
my
phone
turned
red
,
warning
me
to
charge
it
.
from
Latin
indicare
“
to
point
out
”
+
English
-or
,
dating
to
the
early
17th
century
noun
in
chemistry
,
a
substance
that
changes
colour
to
show
whether
a
solution
is
acidic
,
neutral
,
or
alkaline
•
Litmus
paper
is
a
common
indicator
used
in
school
experiments
.
Litmus
paper
is
a
common
indicator
used
in
school
experiments
.
•
The
solution
turned
pink
when
the
phenolphthalein
indicator
was
added
.
The
solution
turned
pink
when
the
phenolphthalein
indicator
was
added
.
scientific
use
dates
from
the
late
19th
century
,
when
chemists
began
employing
colour-changing
compounds
to
test
solutions
