Simple Definition of useful
: helping to do or achieve something
Full Definition of useful
1 : capable of being put to use; especially : serviceable for an end or purpose <useful tools>
2 : of a valuable or productive kind <do something useful with your life>
Examples of useful
Does anyone have any useful suggestions?
It can be useful to know CPR.
The Internet is useful for finding information quickly.
She has become one of the team's most useful players.
Why don't you do something useful with your life?
First Known Use of useful
Seen and Heard
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