Commonwealth English is the name for a mythical variety of English which is only defined as “not U.S.”, and ignores the fact that the Commonwealth of Nations is an international organization whose membership changes regularly.
There is no such distinct variety defined by either accent, vocabulary, or spelling and orthography. English within the Commonwealth of Nations is diverse – for example, Canadian English is more closely related to (U.S.) American English than to any other variety – while English dialects can
cross the bounds of the Commonwealth, like
Irish English, spoken in the Republic of Ireland which is
left the Commonwealth a half-century ago, and in Northern Ireland a part of the
United Kingdom, a charter member of the Commonwealth of Nations.