IPA: /ɪnˈfrikwəns/
KK: /ɪnˈfrikwəns/
The condition of happening rarely or not often; a lack of frequency.
The infrequency of the bus service made it difficult for residents to travel.
Infrequence → It is formed from "in-" (meaning not) and "frequentia" (from Latin, meaning frequency or occurrence). The word "infrequence" means the state of not occurring often or being rare.
Think of 'not' ('in-') occurring often ('frequentia') — that's why infrequency means something that doesn't happen often.