Definition of “piece” - Learner’s Dictionary

piece

noun [ C ] uk us /piːs/
AMOUNT/PART

A2 an amount of something, or a part of something:

a piece of paper/wood
She cut the flan into eight pieces.
Some of the pieces seem to be missing.
These shoes are falling to pieces (= breaking into pieces).
ONE

A2 one of a particular type of thing:

a useful piece of equipment
It's a beautiful piece of furniture.
SOME

B1 some of a particular type of thing:

a piece of news/information
Can I give you a piece of advice?
ART/WRITING, ETC

B2 an example of artistic, musical, or written work:

There was an interesting piece on alternative medicine in the paper yesterday.
He's got two pieces on show in the Summer exhibition.
ten-/twenty-, etc pence piece

a coin with a value of ten/twenty, etc pence (= British money) :

Have you got any twenty-pence pieces for the parking meter?
→ See also set-piece , be a piece of cake , give sb a piece of your mind , go/fall to pieces

(Definition of “piece” from the Cambridge Learner's Dictionary © Cambridge University Press)