noun / verb
phase
FAYZ/feɪz/
A distinct stage in a process or cycle.
The chrysalis is a distinct phase between caterpillar and adult butterfly.

Etymology
Greek phasis meant “appearance,” especially a celestial body's visible aspect. From the moon's changing appearances, phase broadened to a distinct stage that a developing process presents at a particular time.
In context
the project entered the design development phase in June of 2019 during this phase the design became more detailed and a design team did a new cost estimate
More examples
- Many toddlers go through a phase of refusing new foods.
- The moon passes through the same phases each month.
- We phase in the new schedule over several weeks.
- The company plans to phase out its older equipment.
Forms
phase · phases · phased · phasing