1. (NAK) The mnemonic for ASCII character 21.
Sometimes used as the response to receipt of a corrupted packet of information.
Opposite of acknowledgement.
2. (NAK) Any message transmitted to indicate that some data has been received incorrectly, for example it may have a checksum or message length error. A NAK message allows the sender to distinguish a message which has been received in a corrupted state from one which is not received at all.
An alternative is to use only ACK messages, in which case the non-receipt of an ACK after a certain time is counted as a NAK but gives no information about the integrity of the communications channel.
See also ACK.
- Negative advertisement
noun See negative advertising
noun 1. the increase of the principal of a loan by the amount by which periodic loan payments fall short of the interest due, usually as a result of an increase in the interest rate after the loan has begun.
- Negative advertising
noun an approach to advertising that focuses on negative aspects of a rival product or candidate; also called negative advertisement Examples Negative advertising usually backfires on a candidate.
- Negative base excess
negative base excess n. A measure of metabolic acidosis based on the amount of strong alkali that would have to be added per unit volume of whole blood to titrate it to pH 7.4 while at a specified temperature and carbon dioxide pressure.