American English

Definition of apparatus noun from the Oxford Advanced American Dictionary

     

    apparatus

     noun
    noun
    NAmE//ˌæpəˈræt̮əs//
     
    , NAmE//‑ˈreɪt̮əs//
     
    (pl. apparatuses) (formal)
     
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  1. 1[uncountable] the tools or other pieces of equipment that are needed for a particular activity or task a piece of laboratory apparatus Firefighters needed breathing apparatus to enter the burning house. Thesaurusequipmentmaterial gear kit apparatusThese are all words for the things that you need for a particular purpose or activity.equipment the things that are needed for a particular purpose or activity:camping equipment a piece of laboratory/medical equipmentmaterial things that are needed for a particular activity:household cleaning materials teaching materialequipment or material?Equipment is usually solid things, especially large ones. Materials may be liquids, powders, or books, CDs, etc. containing information, as well as small solid items.gear the equipment or clothes needed for a particular activity:Camping gear can be expensive.kit a set of tools or equipment that you use for a particular purpose:a first-aid kit a sewing kitapparatus (formal) the tools or other pieces of equipment that are needed for a particular activity or task:breathing apparatus for firefighters laboratory apparatus Apparatus is used especially for scientific, medical, or technical purposes.Patterns electrical/electronic equipment/gear/apparatus sports equipment/gear camping equipment/gear a piece of equipment/apparatus
  2. 2[countable, usually singular] the structure of a system or an organization, particularly that of a political party or a government the power of the state apparatus
  3. 3[countable, usually singular] (technology) a system of organs in the body the sensory apparatus
See the Oxford Advanced Learner's Dictionary entry: apparatus