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Definition of Bottom-up
1. Adjective. Of an approach to a problem that begins with details and works up to the highest conceptual level. "A bottom-up model of the reading process"
Antonyms: Top-down
Definition of Bottom-up
1. Adjective. of, or relating to a hierarchical system that progresses from multiple, small subunits to a single, large basic unit ¹
¹ Source: wiktionary.com