Definitions of phase

  1. To disturb the composure of; to disconcert; to nonplus.
  2. arrange in phases or stages; " phase a withdrawal"
  3. adjust so as to be in a synchronized condition; " he phased the intake with the output of the machine"
  4. ( astronomy) the particular appearance of a body's state of illumination ( especially one of the recurring shapes of the part of Earth's moon that is illuminated by the sun); " the full phase of the moon"
  5. a particular point in the time of a cycle; measured from some arbitrary zero and expressed as an angle
  6. any distinct time period in a sequence of events; " we are in a transitional stage in which many former ideas must be revised or rejected"
  7. ( physical chemistry) a distinct state of matter in a system; matter that is identical in chemical composition and physical state and separated from other material by the phase boundary; " the reaction occurs in the liquid phase of the system"
  8. A homogenous, physically distinct portion of matter in a system not homogeneous; as, the three phases, ice, water, and aqueous vapor. A phase may be either a single chemical substance or a mixture, as of gases.
  9. In certain birds and mammals, one of two or more color variations characteristic of the species, but independent of the ordinary seasonal and sexual differences, and often also of age. Some of the herons which appear in white and colored phases, and certain squirrels which are sometimes uniformly blackish instead of the usual coloration, furnish examples. Color phases occur also in other animals, notably in butterflies.
  10. That which is exhibited to the eye; the appearance which anything manifests, especially any one among different and varying appearances of the same object.
  11. Any appearance or aspect of an object of mental apprehension or view; as, the problem has many phases.
  12. A particular appearance or state in a regularly recurring cycle of changes with respect to quantity of illumination or form of enlightened disk; as, the phases of the moon or planets. See Illust. under Moon.
  13. A particular aspect or appearance, as, a phase of the moon; any of the changing appearances that an object or thing may take; one side or view of a subject. Also, phasis.
  14. Appearance; one of a series of changes.