noun
the quality of being useful or helping someone achieve a purpose
The usefulness of this app is clear.
We discussed the usefulness of the new training for employees.
Good to know
Usefulness means how useful something is. Do not confuse it with use, which can also mean an action or purpose.
Common phrases & grammar
practical usefulness · question the usefulness of something · show the usefulness of something · the usefulness of a tool
the usefulness of + noun
the usefulness of + noun + for + noun