Please do not post philosophical definitions you found on dictionary.com. Dictionary.com provides uses of words. Which are not always corect.
From the same site:
Quote:
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2. Persuit of one's ideals
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Not right.
Why don't you consult your philosophical dictionary? Or get one?
As to Plato I strongly urge you to actually read at least some of his dialogues (I suggest Politia for some of the best and worst of his work) before telling me he's not an idealist.
Obviously modern idealism has progressed (or fractioned, as many would say) into various forms.
Edit: slash