This is the 6834th most frequent French word.
leclef
"The key."
Here, 'clef' refers to a physical key used for locking or unlocking mechanisms.
La clef est nécessaire pour ouvrir la porte.
The key is necessary to open the door.
Here, 'clef' metaphorically represents the solution or crucial element needed.
Il a la clef pour résoudre ce mystère.
He has the key to solve this mystery.
In this sentence, 'clef' is used in a musical context, referring to a notation symbol used to indicate pitch.