The distinction between matter and dimension does not fully account for impenetrability, since Aquinas and the Scholastic tradition locate resistance in quantified extension itself, not in matter alone.

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Aquinas: Thomas Aquinas was a medieval Italian priest and philosopher (1225-1274) who became one of the most influential thinkers in Western history. He attempted to show that Christian faith and human reason are compatible, arguing that we can use logic and observation to understand God and the natural world. His ideas deeply shaped Catholic theology and continue to influence how religious and secular institutions think about ethics, knowledge, and the relationship between science and belief.
Dimension (or quantified extension)(as distinguished from matter in the statement): The amount of space something takes up—its size, length, width, and depth; 'quantified' just means measured or counted.
Impenetrability(Leibniz, NE, Book II, Ch. iv): Equivalent to solidity; a body's resistance to occupying the same place as another body.
Locate (in philosophical sense)(as used when discussing what causes resistance): To identify or pinpoint where something comes from or what causes it—not about physical location, but about identifying the source or basis of something.

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