SaskatchewanPronunciation: /səˈskatʃɪwən/Definition of Saskatchewan 1a province of central Canada; population 968,157 (2006); capital, Regina. 2a river of Canada. Rising in two headstreams in the Rocky Mountains, it flows eastwards for 596 km (370 miles) to Lake Winnipeg. Saskatchewan in other Oxford dictionaries Definition of Saskatchewan in the US English dictionary