Thank you good people, I thought as much, altho' my research indicates that the word was 'borrowed' from The First Whigs: The Politics of the Exclusion Crisis, 1678–1683.Oxford 1961, were not genuine Labour party members.
To reply to Thomas' endline, Synonym is defined in a thesaurus as... B. similar in meaning.
C. pronounced the same.
D. opposite in meaning.
analogue, equivalent, perhaps even metonym in some circumstances.
Personally, I feel the closest definition you will unearth of this very old word is 'alternate word', or 'alternative', other than that no modern definition exists..
That would really have rather more than impossible. The Whigs were originally a group of Scottish rebels, or Whiggamores, in the 17th century. The name soon after was applied to those opposing the ascent to the throne of the Catholic James 2nd. Later, in the 19th century, they became the large manufacturers and industrialists. Now they are the Liberals. Fascinating how usage changes.