adjective 1. being of use or service; serving some purpose; advantageous, helpful, or of good effect: a useful member of society. 2. of practical use , as for doing ... dictionary.reference.com
Definition of USEFUL. 1: capable of being put to use; especially: serviceable for an end or purpose 2: of a valuable or productive kind www.merriam-webster.com
useful adj. Having a beneficial use; serviceable: a useful kitchen gadget. Being of practical use: a useful job; useful members of society www.answers.com
useful (y s f l) adj. 1. Having a beneficial use; serviceable: a useful kitchen gadget. 2. Being of practical use: a useful job; useful members of society. www.thefreedictionary.com