informant Meaning, Definition & Usage

  1. noun a person who supplies information
    source.
  2. noun someone who sees an event and reports what happened
    witnesser; witness.

WordNet

In*form"ant noun
Etymology
L. informans, -antis, p.pr. of informare. See Inform, v. t.
Definitions
  1. One who, or that which, informs, animates, or vivifies. Obs. Glanvill.
  2. One who imparts information or instruction.
  3. One who offers an accusation; an informer. See Informer. Obs. or R.
    It was the last evidence of the kind; the informant was hanged. Burke.

Webster 1913