-al
/əl/suffix
1(Forming adjectives) relating to; of the kind of.
1.1From Latin words: annual infernal
1.2From Greek words: historical comical
1.3From English nouns: tidal
2Forming nouns chiefly denoting verbal action: arrival transmittal
Origin
sense 1 from French -el or Latin -alis; sense 2 from French -aille or from Latin -alis functioning as a noun ending.