The phrase "lapse rate" refers to the rate at which the temperature changes as you go higher up in the atmosphere. It helps us understand how the temperature decreases or increases with altitude. Full definition
For reasons we will discuss later, the best way to measure the water vapor feedback is to combine it with lapse rate feedback. (atmos.albany.edu)
Again you don't have much say in this as nature dictates lapse rates as a function of pressure, temperature, and moisture. (judithcurry.com)
I recall it was you that once said that the 33 degree warming was actual something like 60 or 70 C, brought down to 33 by lapse rate arguments. (judithcurry.com)