From Middle English yester-, yister-, from Old English ġeostran-, ġiestran- (“previous day, prior day”), from Proto-Germanic *gistr- (“yesterday”) (cf. Dutch gisteren, German Gestern), from Proto-Indo-European *dʰǵʰyes- (“yesterday”). Cognate with Gothic 𐌲𐌹𐍃𐍄𐍂𐌰- (gistra-, “tomorrow”), Latin hesternus (“of yesterday”), Ancient Greek χθές (khthés, “yesterday”), Sanskrit ह्यस् (hyas, “yesterday”). More at yesterday.
- (rare) Belonging to the day preceding the present; next before the present.
- Denoting former, earlier, or previous times.