(idiomatic, pharmacology, medicine) Of drugs, dispensed by a pharmacist without needing a doctor's prescription or other form of compliance.

The quality of being countable.

(pharmacology, of medicine and other treatments) Legal for sale or distribution without the requirement of a prescription.

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

(fencing) A parry that is done to defend against an opponent's parry and riposte.

Alternative form of countertenor

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

To attack in response to an attack by opponents.

An attack made in response to an attack by the opponents

To have a contrary or opposing effect or force on / To deliberately act in opposition to, to thwart or frustrate