Definition.com
Man (n.) is a force for staying alive that the power of outside causes infinitely surpasses.
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Man (n.) is the most useful thing in the world — to man.
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Man (n.) is to man a God — and yet so envious and troublesome a neighbour that he can neither live well with others nor bear to live alone.
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Man (n.) is not a substance: there can be many men, and any one of them might not exist.
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Man (n.) is an animal of erect stature to whoever most admires stature; to others a laughing animal, a featherless biped, a rational animal — everyone defines by the habit of his body.