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Meaning of ideatum

i•de•a•tum

Pronunciation: (ī"dē-ā'tum, ē"dē-), [key]
— pl. -ta
  1. (in epistemology) the object of knowledge as known by the mind. Cf. datum (def. 3).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.