The state or property of having equal velocity or speed.
From 'equi-' (equal) plus 'velocity' from Latin 'velocitas' (swiftness), from 'velox' (fast). A technical physics and mechanics term.
In physics, objects moving at equivelocity appear stationary to each other—it's why riding in an airplane, you don't feel movement even though you're traveling 500 mph; this principle revolutionized how we understand motion and relativity.
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