The term 'two solitudes' refers to the concept of a divided society in Canada, primarily highlighting the cultural and social separation between English-speaking and French-speaking Canadians. This idea encapsulates the challenges of national unity, where each group maintains its distinct identity, often leading to misunderstandings and a lack of communication between them. The concept is significant in understanding the complex dynamics of Canadian society during the Trudeau years, particularly as multiculturalism and bilingualism became central themes in addressing these divisions.