adjective: (number theory, of two or more positive integers) Having no positive integer factors in common, aside from 1.
adjective: (number theory, of a positive integer) Having no positive integer factors, aside from 1, in common with one or more specified other positive integers.
adjective: (algebra, by extension, of two or more polynomials) Whose greatest common divisor is a nonzero constant (i.e., polynomial of degree 0).