an expression whose meaning cannot be determined from its context
"The judge dismissed the contract because a crucial clause contained such severe ambiguity that its true intent could not be inferred from the surrounding text."
unclearness by virtue of having more than one meaning
"The contract clause creates ambiguity because it could be interpreted as either a refund or a store credit."
Something, particularly words and sentences, that is open to more than one interpretation, explanation or meaning, if that meaning etc cannot be determined from its context.
"The contract's clause on termination created so much ambiguity that neither party knew exactly when their agreement would end."