(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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). useful. Retrieved September 23, 2026, from http://smartdefine.org/useful/definitions/2078363 |
| Chicago | Webster's. 2011. "useful" http://smartdefine.org/useful/definitions/2078363 (accessed September 23, 2026). |
| Harvard | Webster's 2011, useful, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/useful/definitions/2078363>. |
| MLA | Webster's. "useful" 28 May 2011. Web. 23 September 2026. <http://smartdefine.org/useful/definitions/2078363> |