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What does AR stand for?

AR stands for Alarm Reaction

This definition appears frequently

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Other Resources:
We have 156 other meanings of AR in our Acronym Attic

Samples in periodicals archive:

The opioid addict's brain has been conditioned to have an alarm reaction at the first sign of any physical pain or discomfort--which always occurs even after a short-term inpatient detox (the HMO's idea of a successful treatment episode).
2) The alarm reaction produces physiological changes, known collectively as "fight-or-flight" syndrome, in response to an emergency.