Definition of parity check
par´i`ty check`
n.
1.
(Computers)
The
act
or
process
of
testing
whether
a
byte
or
other
data
structure
has
an
even
or
odd
number
of
bits
set
to
the
value
of
1
; -
it
is
used
primarily
to
detect
errors
in
data
,
especially
in
memory
banks
or
in
data
transmitted
over
a
communications
line
.
The
parity
can
be
changed
by
assigning
one
bit
in
each
data
structure
as
the
parity bit
,
so
that
the
total
number
of
bits
set
to
the
value
of
1
is
odd
(
odd
parity
)
or
even
(
even
parity
).
If
parity
is
used
for
error
checking
the
writing
and
reading
systems
must
first
agree
on
which
type
of
parity
(
odd
or
even
)
to
use
;
if
the
reading
system
detects
a
deviation
from
the
agreed
parity
,
it
signals
an
error
,
to
be
handled
by
the
error-handling
processes
of
the
system
.
Related Words
check
,
confirmation
,
odd-even
check
,
redundant
check
,
substantiation
,
verification
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