noun
Technical term used in computing and telecommunications for a positive acknowledgement signal.
肯定応答が返ってくるまでデータを再送する。
Resend the data until an acknowledgement is returned.
Negative acknowledgement (NAK), the opposite signal.
Compound of 肯定 (affirmation) and 応答 (response), likely a calque from English 'acknowledgement' in technical contexts.