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


2 [kom-pakt]
a formal agreement between two or more parties, states, etc.; contract: the proposed economic compact between Germany and France.

1580–90; < Latin compactum, compectum, noun use of neuter of compactus (past participle of compacīscī to make an agreement), equivalent to com- com- + pac- (stem of pacīscī to secure by negotiation, akin to pāx settlement ending hostilities, peace) + -tus past participle ending

treaty, pact, entente, convention, concordat. See agreement. 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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Computing Dictionary

compact definition

1. (Or "finite", "isolated") In domain theory, an element d of a cpo D is compact if and only if, for any chain S, a subset of D,
d <= lub S => there exists s in S such that d <= s.
I.e. you always reach d (or better) after a finite number of steps up the chain.
("<=" is written in LaTeX as \sqsubseteq).
[Jargon File]
2. Of a design, describes the valuable property that it can all be apprehended at once in one's head. This generally means the thing created from the design can be used with greater facility and fewer errors than an equivalent tool that is not compact. Compactness does not imply triviality or lack of power; for example, C is compact and Fortran is not, but C is more powerful than Fortran. Designs become non-compact through accreting features and cruft that don't merge cleanly into the overall design scheme (thus, some fans of Classic C maintain that ANSI C is no longer compact).

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
The short, compact dogs' small, slanted eyes suggest a close kinship to the wolf.
Their relatively short wavelength makes the transmission equipment compact and the antennas small.
If the old compact has been discarded, make a new one and trade dollars for
The payback on investing in a compact fluorescent bulb, therefore, is less than
  a year.
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