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threshold
noun
A
strip
of
wood
,
stone
,
or
metal
forming
the
bottom
part
of
a
doorway
that
you
step
over
when
entering
or
leaving
a
room
or
building
.
•
She
tripped
over
the
threshold
as
she
hurried
into
the
house
.
She
tripped
over
the
threshold
as
she
hurried
into
the
house
.
•
A
new
welcome
mat
lay
on
the
wooden
threshold
of
their
cottage
.
A
new
welcome
mat
lay
on
the
wooden
threshold
of
their
cottage
.
Old
English
therscold
,
threscold
,
of
Germanic
origin
;
related
to
thresh
(
verb
)
and
the
notion
of
treading
.
noun
The
level
,
point
,
or
moment
at
which
something
begins
,
changes
,
or
has
an
effect
,
especially
marking
the
start
of
a
new
stage
.
•
Scientists
believe
we
are
on
the
threshold
of
a
major
discovery
.
Scientists
believe
we
are
on
the
threshold
of
a
major
discovery
.
•
At
eighteen
,
she
stood
on
the
threshold
of
adulthood
.
At
eighteen
,
she
stood
on
the
threshold
of
adulthood
.
Figurative
sense
recorded
from
the
19th
century
,
extending
the
idea
of
stepping
over
a
doorway
into
a
new
space
.
noun
The
minimum
intensity
,
value
,
or
level
that
a
stimulus
,
signal
,
or
process
must
reach
before
it
produces
a
response
or
change
.
•
The
sensor
lights
up
only
when
the
sound
level
crosses
the
threshold
.
The
sensor
lights
up
only
when
the
sound
level
crosses
the
threshold
.
•
Doctors
tested
his
hearing
threshold
in
a
silent
booth
.
Doctors
tested
his
hearing
threshold
in
a
silent
booth
.
Technical
usage
arose
in
physiology
and
engineering
in
the
early
20th
century
to
describe
measurable
limit
points
.