Definitions
1.AdjectiveInvolving crosses between several or all possible combinations.
2.AdjectiveOf lines: Meeting and intersecting; not parallel.
3.NounA set of all possible pairs of items from a specified set of items, especially when used for a study of diallel crosses.
4.NounA form of logical fallacy in which a proposition that is required to prove another proposition can only be proved by means of assuming the truth of the proposition one is trying to prove; circular reasoning.