If you take a step, you lift your foot and put it down in a different place,
for example when you are walking: He heard steps in the corridor.
If someone or something has reached a certain stage, level, or amount,
they are at that stage*, level, or amount: We're told the figure could reach 100,000 next year.
A stage of an activity, process, or period is one part of it: The way children talk about or express their feelings
depends on their age and stage of development.
Development is the gradual growth or formation of something:
аn ideal system for studying the development of the embryo.
The growth of something such as an industry, organization, or idea is its development
in size, wealth, or importance: the growth of nationalism. Japan's enormous* economic growth.
Something that is enormous is extremely large in size or amount: The main bedroom is enormous.