not definitely or precisely determined or fixed; vague
said of mathematical equations: having an infinite number of solutions
being a mathematical expression of undefined value
indeterminacy /-si/ noun
indeterminately adv
indeterminateness noun
indetermination /-ʹnaysh(ə)n/ noun
[Middle English indeterminat from late Latin indeterminatus, from in-1 + Latin determinatus, past part. of determinare: see determine]