IPA: /nɒnˈjuːnɪvɜːrsl/
KK: /nɑnˈjunɪvərsəl/
Not applicable or relevant to all cases or situations; limited in scope or reach.
The theory presented is nonuniversal, meaning it does not apply to every culture.
Nonuniversal → It is formed from "non-" (meaning not) and "universal" (from Latin "universalis", meaning pertaining to all or whole). The word "nonuniversal" means not pertaining to all or not applicable to everyone.
Think of 'non-' meaning 'not' and 'universal' meaning 'pertaining to all' — so nonuniversal describes something that does not apply to everyone.