IPA: //nɒnˈrɛl.ə.vənt//
KK: /nɑnˈrɛl ə vənt/
Not connected or applicable to the matter at hand.
The information provided was nonrelevant to the discussion we were having.
Nonrelevant → It is formed from "non-" (meaning not) and "relevant" (from Latin "relevare", meaning to lift up or raise). The word "nonrelevant" means not relevant or not applicable to the matter at hand.
Think of 'not' ('non-') and something that is 'lifted up' or 'important' ('relevant') — so nonrelevant means it is not important or applicable.