The antonyms for "non-observance" are words that describe the act of abiding by rules, laws or traditions. Some examples of antonyms for "non-observance" are compliance, conformity, adherence, observance, and obedience. Compliance is when one follows a set of rules or regulations. Conformity is when someone behaves in a way that is similar to others. Adherence is when one follows and sticks to a specific set of beliefs or practices. Observance is when one follows religious or traditional practices. Obedience is when one follows instructions or orders from an authority figure. These antonyms emphasize the importance of keeping up with social norms and behaving in accordance with established expectations.