Plural of adoptability; the multiple qualities or capacities of being suitable for adoption.
From adopt + -ability (quality of being able) + -ies (plural). The term builds on the original Latin 'adoptare' meaning to accept as one's own or to take up.
Using the plural 'adoptabilities' is actually a linguistic choice—it suggests that something can be adoptable in *multiple different ways*, which is a subtle grammatical way of saying flexibility!
Complete word intelligence in one call. Free tier — 50 lookups/day.