Proportion is the relationship in size, amount, or degree between different things. It can also mean a part or share of a whole.
From Latin *proportio* 'comparative relation, symmetry', from *pro-* 'according to' and *portio* 'portion, part'. It focused on how parts relate harmoniously to each other.
Proportion is really about parts matching each other in a pleasing or fair way. That’s why it shows up in math, art, and even emotions—being 'out of proportion' feels wrong in all three.
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