Spirometry (meaning the measuring of breath) is the most common of the pulmonary function tests (PFTs), measuring lung function, specifically the amount (volume) and/or speed (flow) of air that can be inhaled and exhaled. Spirometry is an important tool used for generating pneumotachographs, which are helpful in assessing conditions such as asthma...
• (n.) The act or process of measuring the chest capacity by means of a spirometer.
Measurement of volume of air inhaled or exhaled by the lung. ... (12 Dec 1998) ... 
(spi-rom´ә-tre) measurement of the breathing capacity by means of a spirometer; results can record total lung capacity, vital capacity, tidal volume, functional residual capacity, and residual volume. incentive spirometry a goal-oriented inhalation maneuver in which the patient is ...
Spi·rom'e·try noun The act or process of measuring the chest capacity by means of a spirometer. 
Type: Term Pronunciation: spī-rom′ĕ-trē Definitions: 1. Making pulmonary measurements with a spirometer.
Spirometry: A test of the air capacity of the lung. The test utilizes a machine called a spirometer to measure the volume of air inspired and expired by the lungs.
a test of lung condition; a person breathes into a machine called a spirometer that measures the volume of air exhaled 
noun the use of a spirometer to measure vital capacity