IPA: /nɒnˈrɪspɒns/
KK: /nɑnˈrɪspɑns/
The situation where someone does not reply or react to something, such as a question or request.
The survey had a high rate of nonresponse, making it difficult to gather accurate data.
Nonresponse → It is formed from "non-" (meaning not) and "response" (from Latin "respondere", meaning to answer). The word "nonresponse" means the absence of an answer or reply.
Think of 'not' ('non-') having an 'answer' ('response') — that's why nonresponse means there is no answer.