- The definition of useful is helpful or beneficial.
An example of useful used as an adjective is the phrase "useful information" which means information that is helpful.
Used by arrangement with John Wiley & Sons, Inc.
- Having a beneficial use; serviceable: a useful kitchen gadget.
- Being of practical use: a useful job; useful members of society.
- useˈful·ly adverb
- useˈful·ness noun