Any process that directly reduces a threat or vulnerability.

Reactive methods used to prevent an exploit from successfully occurring once a threat has been detected. Intrusion Prevention Systems (IPS) commonly employ countermeasures to prevent intruders form ga [..]

1923, from counter- + measure (n.).

1. [An] action, device, procedure, technique, or other measure that reduces the vulnerability of an information system (IS). [INFOSEC-99]   2.   Synonymous with Security Measure   [CESG].

noun. With regard to polygraph examinations, any attempt on the behalf of a person to refrain from being categorized as misleading or corrupt. Usually, people might employ physical methods to escalate [..]

An action taken or a physical capability provided whose principal purpose is to reduce or eliminate one or more vulnerabilities.

(n) an action taken to offset another action

An activity or initiative to prevent, neutralize, or correct a specific problem.

A security measure implemented in order to mitigate an identified risk, or perhaps to maintain a baseline level of security (as, for example, in the case of the HMG Baseline Countermeasure Set).

Techniques and routines designed to prevent or reverse unwanted effects of Weightlessness experienced during actual and simulated Space Flight, including physiologic changes related to removal of grav [..]

A countermeasure is an action or method that is applied to prevent, avert or reduce potential threats to computers, servers, networks, operating systems (OS) or information systems (IS). Countermeasur [..]

any action or device that reduces a computer system's vulnerability cracker

The deployment of a set of security services to protect against a security threat.

Any action taken to counteract or correct another