(fencing) An attack that responds to the opponent's counter-attack.

Alternative form of countertenor

An attack made in response to an attack by the opponents

To attack in response to an attack by opponents.

(finance) Through direct trade; outside a standard stock exchange. / (pharmacy) Able to be obtained without a doctor's prescription. / (figuratively) Legitimately.

Any political or military action taken to defeat insurgency, especially during guerrilla warfare.

Alternative spelling of counterintelligence

plural of county

More of a hindrance than a help.

A spy working in counterintelligence.