IPA: /ˌkɒntrəˈviːnə/
KK: /kɒntrəˈviːnə/
A person who goes against or violates a rule, law, or agreement.
The contravener was fined for breaking the local regulations.
Contravener → It is formed from "contra-" (meaning against) and "venire" (meaning to come). The word describes someone who comes against or violates a law or rule.
Think of someone who 'comes against' ('contra-') rules or laws — that's why a contravener is someone who violates them.