(US, space science) Originally Lunar Excursion Module, latterly Lunar Module.
(logic) Law of excluded middle.
LEM Sentence Examples
In 1695 the boy Holberg was taken into the house of his uncle, Peder Lem, who sent him to the Latin school, and prepared him for the profession of a soldier; but soon after this he was adopted by his cousin Otto Munthe, and went to him up in the mountains.
The other two methods of pseudo-diagonal identification both involve the exportation of interim LEM model results and their assessment for pseudo-diagonal trends.
Terri, furious with Lem because she thinks he attacked Bird, has a goon beat him up.
I knew I had a prob LEM, but was unable to gather enough evidence to prove it.
It is of course vital to cure not only the symptom but the original prob- LEM.