of a question, not inviting a single, correct answer; divergent. Of a contract, not having a set time limit ( see divergent; open question).
to practise skills beyond the point where proficiency has been reached; to repeat, or seek to memorise, material even after it can be fully recalled. Overlearning is reputed to be valuable to aid recall over time. It is said to be helpful in language learning and as a strategy for some with certain learning difficulties.