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proof
noun
facts
or
information
that
show
something
is
true
or
real
•
The
fingerprints
on
the
glass
were
clear
proof
that
the
burglar
had
been
inside
.
The
fingerprints
on
the
glass
were
clear
proof
that
the
burglar
had
been
inside
.
•
Do
you
have
any
proof
that
the
package
was
mailed
last
week
?
Do
you
have
any
proof
that
the
package
was
mailed
last
week
?
Middle
English
,
from
Old
French
‘
preve
’,
from
Latin
‘
proba
’
meaning
‘
test
’.
adjective
able
to
resist
or
not
be
harmed
by
something
,
especially
water
,
fire
,
or
bullets
•
The
safe
is
fire-proof
and
can
protect
documents
during
a
blaze
.
The
safe
is
fire-proof
and
can
protect
documents
during
a
blaze
.
•
She
bought
a
water-proof
jacket
for
the
hiking
trip
.
She
bought
a
water-proof
jacket
for
the
hiking
trip
.
Extension
of
the
noun
sense
‘
test
’:
something
that
has
passed
the
test
is
‘
proof
’
against
it
.
noun
a
preliminary
printed
copy
of
a
text
or
photo
made
so
that
mistakes
can
be
found
and
fixed
•
The
editor
marked
the
first
proof
with
bright
red
ink
.
The
editor
marked
the
first
proof
with
bright
red
ink
.
•
Please
read
the
page
proofs
carefully
before
we
go
to
press
.
Please
read
the
page
proofs
carefully
before
we
go
to
press
.
Use
in
printing
dates
from
the
1600s
,
when
trial
sheets
were
pulled
from
a
press
to
‘
prove
’
type
was
set
correctly
.
noun
a
logical
set
of
steps
that
shows
a
mathematical
statement
must
be
true
•
In
today
’
s
class
we
wrote
a
proof
for
the
Pythagorean
theorem
.
In
today
’
s
class
we
wrote
a
proof
for
the
Pythagorean
theorem
.
•
A
rigorous
proof
leaves
no
room
for
doubt
or
guesswork
.
A
rigorous
proof
leaves
no
room
for
doubt
or
guesswork
.
The
idea
of
formal
mathematical
proof
was
developed
by
ancient
Greek
mathematicians
such
as
Euclid
.
noun
-
proof
a
number
showing
the
strength
of
an
alcoholic
drink
•
The
rum
is
bottled
at
100
proof
,
making
it
quite
strong
.
The
rum
is
bottled
at
100
proof
,
making
it
quite
strong
.
•
In
the
United
States
,
80
proof
spirits
are
common
in
stores
.
In
the
United
States
,
80
proof
spirits
are
common
in
stores
.
Derived
from
the
18th-century
practice
of
“
proving
”
spirits
by
mixing
them
with
gunpowder
to
test
flammability
—
if
it
ignited
,
the
spirit
was
‘
above
proof
’.
verb
to
treat
or
cover
something
so
that
it
becomes
resistant
to
water
,
fire
,
etc
.
•
We
need
to
proof
the
tent
before
our
camping
trip
.
We
need
to
proof
the
tent
before
our
camping
trip
.
•
The
laboratory
proofed
the
fabric
against
chemical
spills
.
The
laboratory
proofed
the
fabric
against
chemical
spills
.
Verb
use
comes
from
the
idea
of
‘
making
something
proof
’—
ensuring
it
passes
a
test
of
resistance
.
verb
to
allow
bread
dough
to
rest
so
that
it
rises
before
baking
•
Cover
the
bowl
and
let
the
dough
proof
for
an
hour
.
Cover
the
bowl
and
let
the
dough
proof
for
an
hour
.
•
The
baker
proofed
the
baguette
dough
twice
for
better
texture
.
The
baker
proofed
the
baguette
dough
twice
for
better
texture
.
Baking
sense
arose
in
the
19th
century
from
‘
prove
the
yeast
’—
testing
that
it
was
active
by
letting
dough
rise
.
