contestation
noun
[ ˌkɒntɛˈsteɪʃ(ə)n ]
• the action or process of disputing or arguing.
• "ideological contestation over social policy in the European Union"
Origin:
mid 16th century (in the sense ‘solemn appeal or protest’): from Latin contestatio(n- ), from contestari ‘call upon to witness’ (see contest); reinforced by French contestation .