1. (noun)informant, source a person who supplies information Synonyms: origin, beginning, generator, witness, informant, rootage, root, author, seed, reference, source, germ, witnesser, reservoir
2. (noun)witness, witnesser, informant someone who sees an event and reports what happened Synonyms: attestant, watcher, attestator, informant, spectator, viewer, source, attestor, witness, witnesser, looker