Each concept here is mapped to its prerequisites — the ideas you'd need first to understand it — all the way down to four foundations: Space, Time, Energy, Pattern. Click any prerequisite to drill down, or scroll for the chain graph.
Measurement is the process of assigning units as standards against which quantities are compared, building on the concept of unit as a standard quantity that serves as a basis for comparison.
External reference — all senses of the word “measure” on Wiktionary. This atlas concept maps to only the slice of meaning relevant to the prerequisite graph.