noun, plural i·de·a·ta [ahy-dee-ey-tuh, ee-dee-] /ˌaɪ diˈeɪ tə, ˌi di-/.
Examples from the Web for ideatum
It is a specification that emerges, correspondently, in both datum and ideatum, as affairs of the direction of logical movement.Studies in Logical Theory|John Dewey
It is a specification that emerges, correspondently, in both datum and ideatum.Essays in Experimental Logic|John Dewey
Datum and ideatum come first, psychical and physical next in order.
The unquestioned element is the datum; the uncertain element, the ideatum.