代
ダイ, タイ, か.わる, かわ.る, かわ.り, か.わり, がわ.り, が.わり, か.える, よ, しろ, す

substitute, change, convert, replace, period, age, counter for decades of ages, eras, etc., generation, charge, rate, fee

JLPT4 G3 S5 F66

As per 弋# (stake) + 人 person → rotate in keeping watch at a post marked by stakes → *substitute* (for); *alternate*; *take the place* (of); *replace*; *exchange* → *generation* (← one generation replacing the one that preceded it) → *price*; *money*; *materials* (← money exchanged for goods).

[Full Kanji Etymology List]