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Adjective: informatory  in'for-mu,to-ree [N. Amer], in'for-mu-t(u-)ree [Brit]
  1. Providing or conveying information
    "The informatory pamphlet explained the new recycling guidelines";
    - informative

See also: advisory, consultative, consultatory, consultive, exemplifying, illustrative, informative, instructive, newsy, revealing, telling, telltale