Any semi-automatic weapon; semi-shots, smg's, etc. (pronounced seh-MEE) 2 -(n.) An 18-wheeler truck (pronounced seh-MI) 1 - Semi's are only half as fun as automatics. 2 - Aparrently a semi loaded with cocaine and doritos rolled over on the freeway yesterday. #truck #18 wheeler #gat #gun #strap #automatic
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Lesson Summary. 1  Earth science includes many fields of science related to our home planet. 2  Geology is the study of Earth's material and structures and the processes that create them. 3  Oceanography is the study of the oceans: water movement, chemistry and the ocean basins among other things.