counterdemonstration Syllabification: (coun·ter·dem·on·stra·tion)Pronunciation: /ˈkountərˌdemənˈstrāSHən/Definition of counterdemonstration noun a public demonstration organized in order to express opposition to the aims of another demonstration:an effort by right-wing elements to organize a counterdemonstration failedcounterdemonstration in other Oxford dictionaries Definition of counterdemonstration in the British & World English dictionary