A person who provides information to authorities, researchers, or others, especially someone who secretly reports on others' activities.
From Latin 'informare' meaning 'to give form to, describe,' with the agent suffix '-ant.' The word evolved from a neutral term for 'one who informs' to often carrying negative connotations of betrayal or espionage.
The word 'informant' perfectly illustrates how context shapes meaning - in linguistic research, informants are valued contributors sharing their language knowledge, while in crime contexts, they're often viewed with suspicion. This duality reflects our complex relationship with information and loyalty.
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