
The rate at which ascending air cools and descending air warms, given that no heat is added or taken away. The rate for dry air (DALR) is based on 5.4
Found on
http://www.aerofiles.com/glossary.html

(from the article `atmosphere`) ...such as temperature or density, with increasing altitude) of temperature decreases at a rate greater than 1 °C per 100 metres (approximately 1 °F ... ...in the humid eastern United Statesand up to 5 km (3 miles) in the southwestern desert. Under these conditions, when unsaturated air rise...
Found on
http://www.britannica.com/eb/a-z/a/18

The rate of decrease of temperature with increasing altitude in the atmosphere. If heat is neither gained nor lost from the air parcel under consideration, then the lapse rate is said to be adiabatic.
Found on
http://www.chemistry-dictionary.com/definition/adiabatic+lapse+rate.php
No exact match found.