scale

The relative size or extent of something; a ratio that a map or plan is drawn in relation to its original.

• scalable/ˈskeɪləbəl/(adj)可扩展的
• scale/skeɪl/(v)扩大规模；攀登

• at scale
• large scale
• scale of operations
• economy of scale
• global scale
• the scale of the problem

1. 1.The scale of the challenge should not be underestimated — we are talking about changing behaviour across millions of people.
2. 2.The pilot showed promising results, but scaling the model to a national level will require significant additional resources.

• magnitude/ˈmæɡnɪtjuːd/— the size of something
• extent/ɪkˈstent/— the range or reach of something
• scope/skəʊp/— the range of something

from Latin "scala" (ladder, steps)