openingcode
nounUK /ˈəʊpənɪŋ kəʊd/
US /ˈoʊpənɪŋ koʊd/
A special set of letters or numbers that unlocks something.
She typed the openingcode to unlock the secret door.
OTHER MEANINGS
2. The first part of a computer program that starts it up.
The programmer fixed the openingcode so the game would run.
3. A hidden message that starts a puzzle or game.
The openingcode on the card told us where to look first.
4. The starting lines of a secret letter or note.
The openingcode in the letter revealed who sent it.