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Adjective: explanatory  ik'spla-nu,to-ree or ek'spla-nu,to-ree [N. Amer], ik'spla-nu-t(u-)ree or ek'spla-nu-t(u-)ree [Brit]
  1. Serving or intended to explain or make clear
    "explanatory notes"; "an explanatory paragraph";
    - explicative, explicatory

See also: informative, instructive

Encyclopedia: Explanatory