INFORM'ING, participle present tense Giving notice or intelligence; telling. 1. Communicating facts by way of accusation. Informing officer, is an officer whose duty it is to inform against persons for breaches of law, as an attorney-general, a sheriff, constable, or grand juror. A common informer, is any person who informs against another.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI