Not to be confused with State of matterIn the physical sciences, a phase is a region of space, throughout which all physical properties of a material are essentially uniform. Examples of physical properties include density, index of refraction, magnetization and chemical composition. A simple description is that a phase is a region of material that is chemically uniform, physically distinct, and mechanically separable. In a system consisting of ice and water in a glass jar, the ice cubes are one phase, the water is a second phase, and the humid air over the water is a third phase. The glass of the jar is another separate phase.

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  1. A distinguishable part of a sequence or cycle occurring over time.
  2. That which is exhibited to the eye; the appearance which anything manifests, especially any one among different and varying appearances of the same object.
  3. Any appearance or aspect of an object of mental apprehension or view.
    The problem has many phases.
  4. A particular appearance or state in a regularly recurring cycle of changes with respect to quantity of illumination or form, or the absence, of its enlightened disk; as, the phases of the moon or planets. Illustrated in .
  5. Any one point or portion in a recurring series of changes, as in the changes of motion of one of the particles constituting a wave or vibration; one portion of a series of such changes, in distinction from a contrasted portion, as the portion on one side of a position of equilibrium, in contrast with that on the opposite side.
  6. A component in a material system that is distinguished by chemical composition and/or physical state (solid, liquid or gas) and/or crystal structure. It is delineated from an adjoining phase by an abrupt change in one or more of those conditions.
  7. The period of play between consecutive breakdowns.
  8. A haplotype.


  1. To begin—if construed with "in"—or to discontinue—if construed with out—(doing) something over a period of time (i.e. in phases).
    The use of the obsolete machines was gradually phased out as the new models were phased in.
  2. To determine haplotypes in (data) when genotypes are known.

The above text is a snippet from Wiktionary: phase
and as such is available under the Creative Commons Attribution/Share-Alike License.

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