What does maximum magnification mean in lenses?

What does maximum magnification mean in lenses? I'm looking at this forum on photography stack exchange that compares the 50mm f/1.8 II to its STM counterpart, and one of the top comments says that the STM version has a 0.21x "Maximum Magnification" compared to the II's 0.15x. It's implying that the STM's 0.21x is better. What does maximum magnification mean (both technically and in practice...

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