apparatus.

1. Equipment arranged for a particular technical or practical task.

2. A coordinated system of organizations or procedures used to exercise power or perform a function.

3. Notes, references, and related material supporting a scholarly text.

Use it for

Words that belong together

• experimental apparatus
• breathing apparatus

On the page

The apparatus measured pressure at regular intervals.

Usage notes

Primary category: academic / formal. Forms: Singular apparatus; plural apparatuses. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Writing functions: analysis, description. Commonness: moderately common.