名詞 modal:

1. an auxiliary verb (such as `can' or `will') that is used to express modality
   同義詞：modal auxiliary verb, modal auxiliary

形容詞 modal:

1. relating to or constituting the most frequent value in a distribution
   同義詞：average
2. of or relating to a musical mode; especially written in an ecclesiastical mode
3. relating to or expressing the mood of a verb

mod.al

adj.（形容詞）
Of, relating to, or characteristic of a mode.
方式上的：方式的，關(guān)于方式的，或以方式為特征的
Grammar Of, relating to, or expressing the mood of a verb.
【語法】 語氣的：屬于，有關(guān)或表達一個動詞的語氣的
Music Of, relating to, characteristic of, or composed in any of the modes typical of medieval church music.
【音樂】 屬于，關(guān)于中世紀的教會音樂的，以其為特征的，或由這種調(diào)式譜寫的
Philosophy Of or relating to mode without referring to substance.
【哲學(xué)】 模式的：屬于或關(guān)于樣式卻不涉及本質(zhì)的
Logic Expressing or characterized by modality.
【邏輯學(xué)】 程式的：用程式表示的或以其為特征的
Statistics Of or relating to a statistical mode or modes.
【統(tǒng)計學(xué)】 眾數(shù)的：屬于或關(guān)于統(tǒng)計眾數(shù)的

來源：
Medieval Latin mod3lis
中世紀拉丁語 mod3lis
from Latin modus [measure] * see med-
源自 拉丁語 modus [測量] *參見 med-

【引伸】
mo.dally
adv.（副詞）