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atmosphere
noun
the
layer
of
gases
that
surrounds
a
planet
,
especially
Earth
•
The
Earth's
atmosphere
protects
us
from
harmful
solar
radiation
.
The
Earth's
atmosphere
protects
us
from
harmful
solar
radiation
.
•
Scientists
study
the
thin
atmosphere
of
Mars
to
look
for
signs
of
water
.
Scientists
study
the
thin
atmosphere
of
Mars
to
look
for
signs
of
water
.
Mid-17th
century
:
from
Greek
atmos
‘
vapour
’
+
sphaira
‘
sphere
’.
noun
the
general
mood
or
feeling
that
exists
in
a
place
or
at
an
event
•
The
restaurant
had
a
warm
,
cozy
atmosphere
that
made
us
feel
at
home
.
The
restaurant
had
a
warm
,
cozy
atmosphere
that
made
us
feel
at
home
.
•
Laughter
created
a
joyful
atmosphere
at
the
birthday
party
.
Laughter
created
a
joyful
atmosphere
at
the
birthday
party
.
noun
a
unit
for
measuring
pressure
,
equal
to
the
average
air
pressure
at
sea
level
(
about
101
,
325
pascals
)
•
At
sea
level
,
air
pressure
is
about
one
atmosphere
.
At
sea
level
,
air
pressure
is
about
one
atmosphere
.
•
The
diver's
lungs
faced
more
than
two
atmospheres
of
pressure
underwater
.
The
diver's
lungs
faced
more
than
two
atmospheres
of
pressure
underwater
.