1. (forming adjectives) relating to; of the kind of.

(形容詞を作る)...のような、...種類の

from Latin words: annual | infernal.

from Greek words: historical | comical.

from English nouns: tidal.

2. forming nouns chiefly denoting verbal action: arrival | transmittal.

主として動詞から派生した行動を示す名詞を作る

-al (sense 1) from French -el or Latin -alis;

-al (sense 2) from French -aille or from Latin -alis functioning as a noun ending.