Meaning of -AL in English

-AL

■ suffix

1》 (forming adjectives from Latin, Greek, or English words) relating to; of the kind of: tidal.

2》 forming nouns chiefly denoting verbal action: arrival.

Origin

sense 1 from Fr. -el or L. ~is ; sense 2 from Fr. -aille or from L. ~is functioning as a noun ending.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.