Webster's English Dictionary

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yesterday

1. yes.ter.day \'yes-t*rd-e-\ av [ME yisterday, fr. OE giestran dg, 
   fr. giestran yest]erday + dg day; akin to OHG gestaron yesterday, L 
   heri, Gk chthes 1: on the day last past : on the day preceding today  2: at 
   a time not long past : only a short time ago  - yesterday aj
2. yesterday n 1: the day last past : the day next before the present  2: 
   recent time : time not long past  3: past time - usu. used in pl. {all our 
   ~s have lighted fo ols the way to dusty death -Shak.}