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envelope
noun
a
thin
paper
cover
you
put
a
letter
or
card
into
before
sending
or
giving
it
•
Maya
slipped
her
handwritten
note
into
an
envelope
and
sealed
it
with
a
sticker
.
Maya
slipped
her
handwritten
note
into
an
envelope
and
sealed
it
with
a
sticker
.
•
The
birthday
card
arrived
in
a
bright
red
envelope
covered
with
balloons
and
confetti
designs
.
The
birthday
card
arrived
in
a
bright
red
envelope
covered
with
balloons
and
confetti
designs
.
Mid-17th
century
(
in
the
sense
‘
wrapper
,
covering
’):
from
French
enveloppe
,
from
envelopper
‘
to
envelop
’.
noun
a
layer
or
covering
that
surrounds
something
and
separates
it
from
what
is
outside
•
The
earth
’
s
atmosphere
acts
as
an
envelope
protecting
life
from
harmful
radiation
.
The
earth
’
s
atmosphere
acts
as
an
envelope
protecting
life
from
harmful
radiation
.
•
Many
viruses
have
a
lipid
envelope
that
helps
them
enter
human
cells
.
Many
viruses
have
a
lipid
envelope
that
helps
them
enter
human
cells
.
Generalized
from
the
earlier
sense
of
a
wrapper
;
applied
to
protective
outer
layers
in
science
from
the
19th
century
onward
.
noun
(
mathematics
,
physics
,
music
)
a
boundary
curve
,
surface
,
or
outline
that
is
tangential
to
a
family
of
other
curves
or
that
describes
how
something
like
sound
changes
over
time
•
On
the
graph
,
the
smooth
red
line
shows
the
envelope
of
all
the
small
oscillating
curves
.
On
the
graph
,
the
smooth
red
line
shows
the
envelope
of
all
the
small
oscillating
curves
.
•
Engineers
measured
the
pressure
envelope
around
the
speeding
train
to
ensure
passenger
comfort
.
Engineers
measured
the
pressure
envelope
around
the
speeding
train
to
ensure
passenger
comfort
.
Adopted
in
19th-century
mathematics
and
engineering
from
the
idea
of
a
covering
line
or
surface
that
‘
wraps
around
’
others
,
similar
to
a
physical
envelope
.
