1. distinct stages or periods in a process of change or development
2. the different shapes of the moon as seen from Earth during its monthly cycle
Usage: astronomy
3. distinct physical forms of matter with uniform properties throughout
Usage: chemistry; physics

Examples

• The project will be completed in three phases over the next year.
• Children go through different phases as they grow up.
• We studied the phases of the moon in science class.
• The full moon is one of the most recognizable lunar phases.
• Water exists in three phases: solid, liquid, and gas.
• The construction project entered its final phase last month.
• She’s going through a difficult phase right now.