- noun an extra bit added to a data word as a parity check
- noun an odd or even digit that is used to check computer data for errors
- In data transmission, an additional bit, 0 or 1, that is added to each byte sent, so that all bytes are have either an even or odd number of ones or zeroes. At the receiving location the additional bit is checked, to be sure it is the same. If it is, the transmission has passed this test of data integrity.