VERB + NON-NEGATIVE
return
NON-NEGATIVE + NOUN
everything, self-evaluation
adj
Not negative.
a non-negative self-evaluation
Of an element of a partially ordered ring, either positive or zero; not negative; greater than or equal to zero.
Distances are non-negative.
Of a function, functional, etc. which has non-negative values over a particular domain D.
For all x∈D, f(x)>0
The init function is expected to return a non-negative value if everything is OK.