An act of retaliation; a counterattack
Any action in opposition to a previous action.
During the Middle Ages, a series of battles and other contests designed to prepare knights for war.
A series of games; either the same game played many times, or a succession of games related by a single theme; played competitively to determine a single winning team or individual.
A digraph obtained by assigning a direction to each edge in an undirected complete graph.