In a loose, conversational sense, some implies “some, but not all”: when I say Some men are chauvinists, it’s natural to interpret me as implying that others are not. But in a strict, logical sense, some means “at least one” and does not rule out “all”; there’s no contradiction in saying Some men are chauvinists; indeed, all of them are. Many linguists refer to the two meanings as the “upper-bounded” and “lower-bounded” senses, labels borrowed from mathematics, and I could never keep them straight. At last I came across a limpid semanticist who referred to them as the “only” and “at-least”
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