Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: enformer, from Latin informare 'to give shape to', from forma; FORM1

inform

 verb
     
in‧form S2 W2 [transitive] formal
1 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.
2 formal to influence someone's attitude or opinion:
Her experience as a refugee informs the content of her latest novel.

inform on/against somebody

phrasal verb
PMSCP to tell the police or an enemy information about someone that will harm them:
He denied that he had ever informed on his neighbours.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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