This is the 704th most frequent Ukrainian word.
вчора
"Вчора" means "yesterday."
Here, 'вчора' is used as an adverb to specify the past tense of the action.
Вчора я гуляв у парку.
Yesterday, I was walking in the park.
In this context, 'вчора' functions as a noun referring to the previous day.
У мене є спогади про вчора.
I have memories of yesterday.
Here, 'вчора' is used metaphorically in conjunction with 'після' to establish a temporal relationship.