I. ˈyes-tər-(ˌ)dā, -dē adverb
Etymology: Middle English yisterday, from Old English giestran dæg, from giestran yesterday + dæg day; akin to Old High German gestaron yesterday, Latin heri, Greek chthes
Date: before 12th century
1. : on the day last past : on the day preceding today
2. : at a time not long past : only a short time ago
I wasn't born yesterday
• yesterday adjective
II. noun
Date: before 12th century
1. : the day last past : the day next before the present
2. : recent time : time not long past
3. : past time — usually used in plural