“In order to account for the possibility of abstract knowledge, Aristotle and St. Thomas had conceived. an elaborate scheme, according to which things them- selves were credited with virtually intelligible forms, which the human soul was supposed to abstract from things by its active intellect, and to know by its possible intellect.” (Etienne Gilson: The Unity of Philosophical Experience pub. 1937)
There I go again getting fixated on a word or phrase that is replete with creative ambiguity. ‘Virtually intelligible’ is such a locution. I see virtually here meaning originating out of its own power, its own virtue. Of course it is intelligible to the perceiver as an instance of a universal but this nature is inherent. ‘Virtually’ taken in the usual sense refers away from itself towards the root instance, the central example so to speak. ‘She lived for most of the year by herself in Mallorca and they were, as husband and wife, virtually separated’. The common expression ‘virtually identical’ captures this reference to another central example of something.
S.O.D. Virtual: Possessed of certain physical virtues or capacities effective in respect of inherent natural qualities or powers; capable of exerting influence by means of such qualities. (now rare)
Curious that the usual sense of ‘virtually’ has moved away from inherance to an almost opposing sense.