IPA: /nɒnˈvɪʒuəl/
KK: /nɑnˈvɪʒuəl/
Not related to sight or vision; pertaining to senses other than sight.
The nonvisual aspects of the performance were just as important as the visual ones.
Nonvisual → It is formed from "non-" (meaning not) and "visual" (from Latin "visus", meaning sight). The word "nonvisual" means not related to sight or not involving vision.
Think of 'not' ('non-') related to 'sight' ('visual') — that's why nonvisual means something that does not involve sight.