A $1-1$ function is called injective. What is an $n-1$ function called? A $1-1$ function is called injective. What is an $n-1$ function called ?
I'm thinking about homomorphisms. So perhaps homojective ?
Onto is surjective. $1-1$ and onto is bijective.
What about n-1 and onto ? Projective ? Polyjective ?
I think $n-m$ and onto should be hyperjective as in hypergroups.

Perhaps these types of $n-1$ functions are called "$n-to-1$" functions. There is also a "$Division$ $Rule$" which states that if $f$ is a $n-1$ function, then $|X| =n|Y|$, in set theory and counting principles.
