👉 Denumerability is a property of sets that ensures they can be assigned a unique, countable number of elements. In other words, if we have a set S and we assign each element x in S a unique positive integer n such that |x| <= n, then the set S has denumerability. This means that if we apply this process to any subset of S (including all its elements), it will always result in a countable number of distinct elements.