mean by oxm
key doesn't means the key of a door or something it means important, on a root of something.
it means key
Key means "Schlüssel".
it means it is the right thing
ks3 means key stage 3
2 is the activation key for ixl memberships.
Higher education in China utilizes the key-point system which means are placed in key-point schools the smartest students.
a key on a graph is used to show you what each symbol means
The science word "key" means important or critical.
Key or code
A turn key project means that when completed the buyer has to do nothing but turn the key and drive away.
It means "Key to Ludwig von Beethoven's Fifth Symphony", which is C minor