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It is literally a definition: it defines the boundary between what is and isn't bread.

There is a lot of context that is needed to get to a positive identification (maybe the word you meant) of bread, but that is true of many definitions present in dictionaries, etc. today.

Maybe their definition of definition is your definition of bread?

Give us this day our daily definition

At risk of really devolving this thread, I’m pretty sure that bodybuilders generally agree that bread is counter-productive in the pursuit of definition :)

"Bread makes you fat??"

~Scott Pilgrim

Great, now we gotta figure out what a "bodybuilder" is!

One whose body is sufficiently defined.

It offers a one-to-one correspondence between stimuli and classifications, what else could a definition be?

Definitions ideally don't require an oracle.

How then do you define Pythia?

Pythia is a mystery!

That's not how definitions work. I can't know what your brain thinks bread is. And if you die, I can never know.

Definitions do not have to be computable, even in principle. For example, "a Turing machine that halts" is well-defined although there is no algorithm for classifying things into that bin.

https://plato.stanford.edu/entries/meaning/