apparatus

noun

ap·​pa·​ra·​tus ˌa-pə-ˈra-təs  -ˈrā- 

plural apparatuses or apparatus

1

a

: a set of materials or equipment designed for a particular use

b

: a group of anatomical or cytological parts functioning together

mitotic apparatus

c

: an instrument or appliance designed for a specific operation

an apparatus for measuring vision

2

: the functional processes by means of which a systematized activity is carried out

the apparatus of society

: such as

a

: the machinery of government

b

: the organization of a political party or an underground movement

Synonyms of apparatus

• equipment
• gear

Examples of apparatus in a Sentence

Recent Examples on the Web

The blades were smaller then, the towers shorter, the whole apparatus closer to a windmill than the hulking machines erected today—the tallest of which exceed 300 meters, with rotor blades longer than a football field. — Sam Birchall, Fortune, 2 Oct. 2026

While the apparatus of Cockroft and Walton could fit in a room, modern accelerators at facilities like CERN in Switzerland can reach up to 17 miles (27 kilometers) in length. — Andrea Richard, The Conversation, 2 Oct. 2026

For a writer so given to cultural reference, intellectual genealogy, and various explanatory apparatuses, this failure of language is unexpectedly liberating to read. — Zain Khalid, Vulture, 1 Oct. 2026

In its latest incarnation, designed by the firm S9, the curtain wall has darkened and the electronic billboards brightened, so that the tower resembles a TV mount, more apparatus than architecture. — Justin Davidson, Curbed, 1 Oct. 2026

Word History

Etymology

borrowed from Latin apparātus "act of preparing, display, trappings, equipment," from apparāre "to make ready, make preparations for" (from ad- ad- + parāre "to supply, provide, make ready") + -tus, suffix of verbal nouns — more at pare

First Known Use

circa 1628, in the meaning defined at sense 1a

Phrases Containing apparatus

• Golgi apparatus

Rhymes for apparatus

• superlattice
• beatus
• flatus
• gratis
• lattice
• rattus
• satis
• status
• stratus

Kids Definition

apparatus

noun

ap·​pa·​ra·​tus ˌap-ə-ˈrat-əs  -ˈrāt- 

plural apparatuses or apparatus

1

: the equipment or material for a particular use or job

laboratory apparatus

2

: a complicated instrument or device

Medical Definition

apparatus

noun

ap·​pa·​ra·​tus ˌap-ə-ˈrat-əs  -ˈrāt- 

plural apparatuses or apparatus

: a group of anatomical and cytological parts having a common function

the respiratory apparatus

see golgi apparatus