n. The faculty or capacity of the mind for forming ideas; the exercise of this capacity; the act of the mind by which objects of sense are apprehended and retained as objects of thought. [ 1913 Webster ]
The whole mass of residua which have been accumulated . . . all enter now into the process of ideation. J. D. Morell. [ 1913 Webster ]
a. Pertaining to, or characterized by, ideation. [ 1913 Webster ]
Certain sensational or ideational stimuli. Blackw. Mag. [ 1913 Webster ]