出典:Wiktionary
From Middle English therafter, theraftir, þerefter, þerafter, þeræfter, from 古期英語 þǣræfter (“after that; thereafter”), equivalent to there + after. Cognate with Saterland Frisian deerätter (“thereafter”), West Frisian dêrefter (“behind that; thereafter”), Dutch daarachter (“behind that; thereafter”), German Low German daarachter (“behind that”), Danish derefter (“thereafter”), Swedish därefter (“thereafter”).
thereafter (not comparable)
thereafter (countable かつ uncountable, 複数形 thereafters)