1 Honda Civic Mugen Si: The Coupe and Sedan A hot hatch in every sense of the term, the Honda Civic Mugen Si is a powerful, road-hugging beast. 2  Aggressively styled and available with a powerful range of engines, it is â¦.
A formation or geological formation is the fundamental unit of lithostratigraphy. A formation consists of a certain number of rock strata that have a comparable lithology, facies or other similar properties.
Full Definition of CORNERSTONE. 1. : a stone forming a part of a corner or angle in a wall; specifically: such a stone laid at a formal ceremony. 2. See cornerstone defined for English-language learners. See cornerstone defined for kids. ADVERTISEMENT.