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signal
noun
a
movement
,
sound
,
light
,
or
other
action
that
gives
information
or
tells
someone
to
do
something
•
The
green
traffic
light
is
the
signal
that
we
can
cross
the
street
.
The
green
traffic
light
is
the
signal
that
we
can
cross
the
street
.
•
When
the
teacher
raised
her
hand
,
it
was
the
signal
for
the
class
to
be
quiet
.
When
the
teacher
raised
her
hand
,
it
was
the
signal
for
the
class
to
be
quiet
.
From
Latin
‘
signālis
’,
from
‘
signum
’
meaning
‘
mark
’
or
‘
sign
’.
verb
-
signal
,
signalling
,
signals
,
signaled
,
signalled
to
make
a
gesture
,
sound
,
or
action
in
order
to
give
information
or
tell
someone
to
do
something
•
The
lifeguard
signaled
swimmers
to
come
back
to
shore
.
The
lifeguard
signaled
swimmers
to
come
back
to
shore
.
•
If
you
need
the
bill
,
just
signal
the
waiter
by
raising
your
hand
.
If
you
need
the
bill
,
just
signal
the
waiter
by
raising
your
hand
.
noun
a
series
of
electronic
waves
or
pulses
that
carry
sound
,
images
,
or
other
information
from
one
place
to
another
•
The
television
lost
its
signal
during
the
thunderstorm
.
The
television
lost
its
signal
during
the
thunderstorm
.
•
My
phone
shows
only
one
bar
of
signal
in
this
basement
.
My
phone
shows
only
one
bar
of
signal
in
this
basement
.
