the action of inhaling or breathing in: [mass noun]:the inhalation of airborne particles [count noun]:with every inhalation air passes over the vocal cords
Medicine the inhaling of medicines or anaesthetics in the form of a gas or vapour.
[count noun] Medicine a preparation to be inhaled in the form of a vapour or spray.
Origin:
early 17th century: from medieval Latin inhalatio(n-), from inhalare 'inhale'
inhalation in other Oxford dictionaries
Definition of inhalation in the US English dictionary
