-ual suffixof adjs., repr. late L., med.L. -uālis, -uāle, as in conceptual (med.L. conceptuālis), sensual (late L. sensuālis); in adjs. formed from n. stems in -u-, as accentual (L. accentus), eventual (L. eventus); and in adjs. derived from L. adjs. in -uus, as individual (med.L. individuālis, f. L. individuus), perpetual (L. perpetuālis, f. L. perpetuus). (Further information is given at -al suffix.)
-ual/jʊəl/suffix.
ORIGIN: Repr. Late Latin-ualis, -uale.
Forming adjectives with the sense ‘of the kind of, pertaining to’, from Latin nouns with stems in -u-, as accentual, eventual (Latin accentus, eventus), or from Latin adjectives in -uus, as individual (medieval Latin individualis, from Latin. individuus). See also -al1.
-ual
Suffix
See -al.
Etymology
A back-formation from Latin adjectives ending in-uālis, which are formed from fourth-declension nouns suffixed with -ālis