- A stage in the course of change or development.
- A homogeneous, physically distinct, and separable portion of a heterogeneous system; a mixture of oil, gum, and water are three phases of an emulsion.
- The time relationship between two or more events.
- A particular part of a recurring time pattern or wave form.
[G. phasis, an appearance]
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Examples: glitazone, GI cocktail, etc.