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Related to passives: passive voice
grammatical category according to which an action is referred to as done by the subject (active, e.g., men shoot bears) or to the subject (passive, e.g., bears are shot by men). In Latin, voice is a category of inflection like mood or tense.
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1. Chem (of a substance, esp a metal) apparently chemically unreactive, usually as a result of the formation of a thin protective layer that prevents further reaction
2. Electronics Telecomm
a. containing no source of power and therefore capable only of attenuating a signal
b. not capable of amplifying a signal or controlling a function
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
passiveRefers to either the complete absence or to a reduction of electronic processing in a device. For example, "passive 3D" glasses use non-changing lenses in ordinary eyeglass frames in contrast to "active 3D" glasses that contain electronic circuits. Passive matrix displays use fewer transistors than their active matrix counterparts. See passive 3D and passive matrix. Contrast with active.
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