1 [adj. kuhm-pakt, kom-, kom-pakt; v. kuhm-pakt; n. kom-pakt]
joined or packed together; closely and firmly united; dense; solid: compact soil.
arranged within a relatively small space: a compact shopping center; a compact kitchen.
designed to be small in size and economical in operation.
solidly or firmly built: the compact body of a lightweight wrestler.
expressed concisely; pithy; terse; not diffuse: a compact review of the week's news.
composed or made (usually followed by of ): a book compact of form and content.
Also, bicompact. 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.
verb (used with object)
to join or pack closely together; consolidate; condense.
to make firm or stable.
to form or make by close union or conjunction; make up or compose.
Metallurgy. to compress (metallic or metallic and nonmetallic powders) in a die to be sintered.
to crush into compact form for convenient disposal or for storage until disposal: to compact rubbish.
a small case containing a mirror, face powder, a puff, and sometimes rouge.
Also called compact car. 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 m 3 ).
Metallurgy. (in powder metallurgy) an object to be sintered formed of metallic or of metallic and nonmetallic powders compressed in a die.

1375–1425; late Middle English < Latin compāctus (past participle of compingere to shut away, bind together), equivalent to com- com- + pag-, variant stem of pangere to fix, arrange (akin to pāx peace; cf. pact, compact2) + -tus past participle suffix

compactedly, adverb
compactedness, noun
compactly, adverb
compactness, noun
uncompacted, adjective
well-compacted, adjective

2. small, snug. 5. concise, succinct, brief. 8. compress. 9. stabilize, solidify. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  closely packed together; dense
2.  neatly fitted into a restricted space
3.  concise; brief
4.  well constructed; solid; firm
5.  (foll by of) composed or made up (of)
6.  denoting a tabloid-sized version of a newspaper that has traditionally been published in broadsheet form
7.  logic (of a relation) having the property that for any pair of elements such that a is related to b, there is some element c such that a is related to c and c to b, as less than on the rational numbers
8.  (US), (Canadian) (of a car) small and economical
9.  to pack or join closely together; compress; condense
10.  (foll by of) to create or form by pressing together: sediment compacted of three types of clay
11.  metallurgy to compress (a metal powder) to form a stable product suitable for sintering
12.  a small flat case containing a mirror, face powder, etc, designed to be carried in a woman's handbag
13.  (US), (Canadian) a comparatively small and economical car
14.  metallurgy a mass of metal prepared for sintering by cold-pressing a metal powder
15.  a tabloid-sized version of a newspaper that has traditionally been publis hed in broadsheet form
[C16: from Latin compactus, from compingere to put together, from com- together + pangere to fasten]

compact2 (ˈkɒmpækt)
an official contract or agreement
[C16: from Latin compactum, from compaciscī to agree, from com- together + paciscī to contract; see pact]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., from L. compactus "concentrated," pp. of compingere "to fasten together," from com- "with, together" + pangere "to fix, fasten." The noun meaning "make-up case" first recorded 1921, based on its containing compacted face powder; compact car is 1960. Compact disc is from 1979.

"agreement," 1591, from L. compactum, pp. of compacisci "come to agreement," from com- "together" + pacisci "to covenant, contract" (see pact).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
When light pierces the compacted ice, red wavelengths are absorbed, leaving a
  ghostly blue glow.
The street is unpaved, muddy and lined with compacted rubbish.
Hydrogen is a gas, which means that it has to be compacted somehow if a usable
  amount is to be carried.
The compacted wall is now bottom heavy, further reducing the chances of
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