Definition of parity bit
par´i`ty bit`
n.
1.
(Computers)
The
bit
within
a
data
structure
which
is
assigned
a
value
of
1
or
0
so
as
to
make
the
parity
{
7
}
of
the
data
structure
odd
or
even
.
Data
structures
may
or
may
not
have
parity
bits
,
dpending
on
whether
the
system
does
or
does
not
perform
parity checking
.
The
most
commonly
used
parity
bit
is
the
eigth
(
higher-order
)
bit
of
a
byte
,
which
is
used
when
data
transmission
uses
only
the
7
lower-order
bits
of
each
byte
as
significant
data
;
some
memory
systems
use
a
ninth
bit
as
a
parity
bit
for
each
eight
bits
(
one
byte
)
of
significant
data
in
memory
.
Related Words
bit
,
check
bit
,
computer
science
,
computing
,
parity
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