(Classical Japanese grammar) a verbal conjugation class consisting of four alternating bases: -a, -i, -u, and -e

steps (up and down); stairs / rating; ranking / row; line (of text) / (mathematics) multiplication table

understanding, comprehension / appreciation

application (the use of a thing) / inflection (of a verb, conjugation; of an adjective or noun, declension)

(grammar) Short for 四段活用 (yodan katsuyō): quadrigrade conjugation

difficult / hard, probably impossible

understand, comprehend / appreciate

(grammar) a verbal conjugation class consisting of five alternating bases: -a, -i, -u, -e, and -o

(grammar) The Classical Japanese bigrade verb conjugation class, consisting of the two subclasses of 上(かみ)二(に)段(だん)活(かつ)用(よう) (kami nidan katsuyō, “upper-bigrade conjugation”) and 下(しも)二(に)段(だん)活(かつ)用(よう) (shimo nidan katsuyō, “lower-bigrade conjugation”)

(linguistics, uncommon) trigrade conjugation / (informal) 3-step process