1. Something that normally follows or results from another situation or action: There is often a corollary of increased crime as a result of poverty.

Destruction and suffering are always corollaries of wars.

2. Etymology: from Latin corollarium, "money paid for a gratuity"; originally "money paid for a garland"; hence "a gift, gratuity, something extra"; and in logic, "a proposition proven from another that has been verified."