Meaning of (ALL) OF A PIECE in English

(ALL) OF A PIECE

( formal )

1.

all the same or similar :

The houses are all of a piece.

2.

all at the same time :

The house was built all of a piece in 1754.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.