Phase Phase (f[=a]z), n.; pl. {Phases} (f[=a]z"[e^]z). [NL. phasis, Gr. ?, fr. ? to make to appear: cf. F. phase. See {Phenomenon}, {Phantom}, and {Emphasis}.] 1. That which is exhibited to the eye; the appearance which anything manifests, especially any one among different and varying appearances of the same object. [1913 Webster]

2. Any appearance or aspect of an object of mental apprehension or view; as, the problem has many phases. [1913 Webster]

3. (Astron.) 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}. [1913 Webster]

4. (Physics) 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. [1913 Webster]

5. (Phys. Chem.) 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. [Webster 1913 Suppl.]

6. (Zo["o]l.) 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. [Webster 1913 Suppl.]

7. (Elec.) The relation at any instant of a periodically varying electric magnitude, as electro-motive force, a current, etc., to its initial value as expressed in factorial parts of the complete cycle. It is usually expressed in angular measure, the cycle beb four right angles, or 360[deg]. Such periodic variations are generally well represented by sine curves; and phase relations are shown by the relative positions of the crests and hollows of such curves. Magnitudes which have the same phase are said to be in phase. [Webster 1913 Suppl.]

8. (Physics) the relation at any instant of any cyclically varying physical quantity, such as voltage in an A.C. circuit, an electromagnetic wave, a sound wave, or a rotating object, to its initial value as expressed as a fractional part of the complete cycle. It is usually expressed in angular measure, the complete cycle being 360[deg].

Note: The concept of phase is also applied generally to any periodically varying phenomenon, as the cycle of daylight. One person who speeps during the day and another who sleeps at noght may be said to be out of phase with each other. [PJC]

The Collaborative International Dictionary of English. 2000.

(as of the moon or a planet), ,

Look at other dictionaries:

  • phase — [ faz ] n. f. • 1661 astron.; h. 1544 fig.; répandu XIXe; gr. phasis « lever d une étoile » 1 ♦ Astron. Chacun des aspects que présentent la Lune et les planètes à un observateur terrestre, selon leur éclairement par le Soleil. ⇒ apparence. Les… …   Encyclopédie Universelle

  • Phase — (altgriechisch φασισ phasis „Erscheinung“) bedeutet: in der Wellenlehre der Schwingungszustand einer Welle an einer bestimmten Stelle und zu einem bestimmten Zeitpunkt, siehe Phase (Schwingung) in der Astronomie die Gestalt eines nicht… …   Deutsch Wikipedia

  • phase — phase, aspect, side, facet, angle are comparable when they denote one of the possible ways in which an object of contemplation may be seen or may be presented. Phase may distinctly imply a change in the appearance of a thing without a change in… …   New Dictionary of Synonyms

  • phase — phase1 [fāz] n. [ModL phasis < Gr < phainesthai, to appear, akin to phainein: see FANTASY] 1. any of the recurrent stages of variation in the illumination and apparent shape of a moon or a planet 2. any of the stages or forms in any series… …   English World dictionary

  • Phase — Sf Abschnitt, Stufe erw. fach. (18. Jh.) Entlehnung. Entlehnt aus frz. phase, dieses aus gr. phásis Erscheinung, Anzeichen , ti Abstraktum von gr. phaínein sichtbar machen, sehen lassen . Die Entwicklung der modernen Bedeutung geht aus von den… …   Etymologisches Wörterbuch der deutschen sprache

  • phase — ► NOUN 1) a distinct period or stage in a process of change or development. 2) each of the aspects of the moon or a planet, according to the amount of its illumination. 3) Physics the relationship between the cycles of an oscillating system and a …   English terms dictionary

  • Phase — (f[=a]z), v. t. [Cf. {Feeze}.] To disturb the composure of; to disconcert; to nonplus; an older spelling, now replaced by {faze}. [Colloq., Archaic] Syn: faze. [Webster 1913 Suppl. +PJC] …   The Collaborative International Dictionary of English

  • Phase — »Abschnitt einer ‹stetigen› Entwicklung, Stufe; Zustand; Schwingungszustand einer Welle (Physik); eine der drei Leitungen des Drehstromnetzes (Elektrotechnik); veränderlicher Zustand, wechselnde Lichtgestalt von nicht selbstleuchtenden… …   Das Herkunftswörterbuch

  • Phase — [Aufbauwortschatz (Rating 1500 3200)] Auch: • Stadium • Stufe • Bühne Bsp.: • Die Forschung befand sich noch in einem frühen Stadium. • Das ist eine wichtige Phase im Leben eines Kindes. • …   Deutsch Wörterbuch

  • phase — phase. См. стадия покоя. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

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