Idea (n.) are something you have — and will get over.
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Idea (n.) of the dominant class are the dominant ideas — in 1925 a Communist student who mentioned Marxism in his examinations would have failed.
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An Idea (n.) for Hume is a chair in consciousness: the idea of a chair and the chair-as-idea are one and the same thing.
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An Idea (n.) that will not be named rolls itself into a ball like a large cat: it explains nothing, does not move, and contents itself with saying no.
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An Idea (n.) is the man himself externalizing himself in the materiality of language — at once his objectification and his alienation.