OCTOGENARIANISM Meaning of OCTOGENARIANISM in English ˌ ̷ ̷ ̷ ̷ ̷ ̷ˈ ̷ ̷rēəˌnizəm noun( -s ) : the state of being an octogenarian Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012