Adu'lt. adj. [adultus, Lat.] Grown up; past the age of infancy and weakness.
They would appear less able to approve themselves, not only to the confessor, but even to the catechist, in their adult age, than they were in their minority; as having scarce ever thought of the principles of their religion, since they conned them to avoid correction. Decay of Piety.
The earth, by these applauded schools, 'tis said,
This single crop of men and women bred;
Who grown adult, (so chance, it seems, enjoin'd)
Did, male and female, propagate their kind. Blackmore.