<p><strong>Adjective</strong></p><ul><li>joined or packed together; closely and firmly united; dense; solid: compact soil</li><li>arranged within a relatively small space: a compact shopping center; a compact kitchen</li><li>designed to be small in size and economical in operation</li><li>solidly or firmly built: the compact body of a lightweight wrestler</li><li>expressed concisely; pithy; terse; not diffuse: a compact review of the week's news</li><li>composed or made (usually followed by of): a book compact of form and content</li><li>Mathematics: (of a set) having the property that in any collection of open sets whose union contains the given set there exists a finite number of open sets whose union contains the given set; having the property that every open cover has a finite subcover</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>to join or pack closely together; consolidate; condense</li><li>to make firm or stable: solidify, stabilize</li><li>to form or make by close union or conjunction; make up or compose</li><li>Metallurgy: to compress (metallic or metallic and nonmetallic powders) in a die to be sintered</li><li>to crush into compact form for convenient disposal or for storage until disposal: to compact rubbish</li></ul><p><strong>Noun</strong></p><ul><li>a small case containing a mirror, face powder, a puff, and sometimes rouge</li><li>an automobile that is smaller than an intermediate but larger than a subcompact and generally has a combined passenger and luggage volume of 100–110 cu. ft. (2.8–3.1 m³)</li><li>Metallurgy: (in powder metallurgy) an object to be sintered formed of metallic or of metallic and nonmetallic powders compressed in a die</li></ul>