Longman Dictionary of Contemporary English - contention

~ n 1 formal an opinion that someone expresses  (Her main contention is that doctors should do more to encourage people to lead healthy lives.) 2 formal argument and disagreement between people  (The issue of subsidies is a great source of contention in Europe.) 3 a bone of contention a subject that causes disagreement or argument  (Their aunt's will has always been a bone of contention between them.) 4 in contention formal being the subject of argument and disagreement  (The issue is no longer in contention.)