|Origin:||enformer, from Latin informare 'to give shape to', from forma; FORM1|
in‧form S2 W2 [transitive] formal
to officially tell someone about something or give them information
inform somebody about/of something
Please inform us of any change of address as soon as possible.
inform somebody (that)
We regret to inform you that your application has been rejected.
They decided to inform the police.
to influence someone's attitude or opinion:
Her experience as a refugee informs the content of her latest novel.
inform on/against somebodyphrasal verb
to tell the police or an enemy information about someone that will harm them:
He denied that he had ever informed on his neighbours.