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Adjective: illative  i-lu-tiv or i'ley-tiv
  1. Relating to or having the nature of illation or inference
    "the illative faculty of the mind";
    - inferential
  2. Resembling or dependent on or arrived at by inference
    "an illative conclusion";
    - inferential
  3. (grammar) expressing or preceding an inference
    "'therefore' is an illative word"

See also: deductive

Encyclopedia: Illative