Correct to the last detail, especially being in or following the exact words.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "letter-perfect" in a sentence
"Their helmets with their double-chinstrap configuration look letter-perfect -- until a player goes into the game, at which point the chances of his helmet popping off are ... let's just say the odds are not acceptable."
"The moment he opened his mouth, I joined the director on stage; we were mesmerized by the intensity and letter-perfect reading which the young actor gave."
"In between, at the Beacon Theatre, the Fab Faux with a full string and horn sections is performing its letter-perfect re-creation of the Beatles' Halloween-iest set ever, "Magical Mystery Tour," presumably for an audience decked out as walruses and eggmen."