0 used to describe words produced without any mistakes, or a person who is able to repeat a particular text from memory without making any mistakes:
She had to hear it only once to give it back to him letter-perfect.
By the time the actors are letter-perfect, the prompt-copy ought likewise to be fairly perfect.
The fellow had studied carefully the shibboleths of the society with which he wished to be intimate and was probably letter-perfect.
He said you were letter-perfect in the part, anyway, and it was the others who really needed the rehearsing.
She was invariably letter-perfect in a play after a couple of rehearsals, and could prompt others if they faltered.
It is also obvious that copy must be letter-perfect.
The two plays were read, rehearsals appointed, and a great deal said about the necessity of being letter-perfect before the next meeting.
Moreover, he never hesitated for a word or stumbled, but was letter-perfect.
