(noun) United States writer whose novels argued for social reform (1878-1968). Synonyms: Sinclair, Upton Sinclair, Upton Beall Sinclair.
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Noun Definition 1
(noun) English electrical engineer who founded a company that introduced many innovative products (born in 1940). Synonyms: Sinclair, Clive Sinclair, Sir Clive Marles Sinclair.