the act of competing

contest

(to make) an attack in reply to an attack by the enemy

retaliation

an action intended to reduce, remove, be a punishment for, another

cure, solution

member of the political party or parties opposing the Government

obstruction, antagonism

the possession of two contrasted or opposing qualities, principles or tendencies

opposition

a response to earlier action or activity; opposition to progress or change; (an instance of) a change in one substance caused by another

response

a cure (for a disease etc); method used for putting something right

cure, solution

(the act, power, of) resisting; (in a country occupied by an enemy) a group of people organized to oppose the enemy; an opposing force

fighting, opposition