In a manner relating to or according to the principles of geometry; with precise mathematical proportions and regular shapes.
From 'geometrical' plus the adverbial suffix '-ly.' This adverb allows description of how something is arranged, designed, or behaves according to geometric principles.
When we say something grows 'geometrically,' we mean it doubles repeatedly—bacteria and viruses spread this way, which is why epidemics can explode so fast!
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