A distinct period or stage in a process of change or development. The project is currently in its final phase.
A particular appearance or state in a regularly recurring cycle of changes. The moon is in its waxing phase.
A stage in a person's psychological development, especially a period of temporary or transitional behavior. Teenagers often go through a rebellious phase.
A distinct form or state of matter, such as solid, liquid, or gas. Water can exist in three phases: solid, liquid, and gas.
The relative position of a point within a repetitive cycle of a waveform, or the relationship in time between two or more such cycles. The two signals are 90 degrees out of phase.