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From The Collaborative International Dictionary of English v.0.48:
Useful \Use"ful\, a. Full of use, advantage, or profit; producing, or having power to produce, good; serviceable for any end or object; helpful toward advancing any purpose; beneficial; profitable; advantageous; as, vessels and instruments useful in a family; books useful for improvement; useful knowledge; useful arts. [1913 Webster] To what can I useful! --Milton. [1913 Webster]