What is ‘-al?

‘-al definition and meaning on Dictionary terms:

a suffix with the general sense a??of the kind of, pertaining to, having the form or character ofa?? that named by the stem, occurring in loanwords from Latin (autumnal; natural; pastoral), and productive in English on the Latin model, usually with bases of Latin origin (accidental; seasonal; tribal). Originally, -al1 was restricted to stems not containing an -l- (cf. -ar1); recent lapses in this rule have produced semantically distinct pairs, as familiar and familial.


reference: https://www.dictionary.com/browse/-al