A dominion was one of the semi-independent polities under the British Crown that constituted the British Empire, beginning with Canadian Confederation in 1867.[1][2] A "dominion status" was a constitutional term of art used to signify a semi-independent Commonwealth realm; they included Canada, Australia, New Zealand, Newfoundland, South Africa, and the Irish Free State. India and Pakistan were also dominions for a short period of time, as was Ceylon (now Sri Lanka). The Balfour Declaration of 1926 recognised the Dominions as "autonomous communities within the British Empire", and the 1931 Statute of Westminster confirmed their full legislative independence.
https://en.wikipedia.org/wiki/Dominion