of great extent; wide; broad: an extensive area.
covering or extending over a great area: extensive travels.
far-reaching; comprehensive; thorough: extensive knowledge.
lengthy: an extensive journey.
great in amount, number, or degree: an extensive fortune; extensive political influence.
of or having extension: Space is extensive, time durational.
noting or pertaining to a system of agriculture involving the use or cultivation of large areas of land with a minimum of labor and expense (opposed to intensive ).

1375–1425; late Middle English < Late Latin extēnsīvus, equivalent to Latin extēns(us) (past participle of extendere to extend) + -īvus -ive

extensively, adverb
extensiveness, extensivity [ek-sten-siv-i-tee, ik-] , noun
nonextensive, adjective
nonextensively, adverb
nonextensiveness, noun
preextensive, adjective
preextensively, adverb

1. extended, large, spacious, ample, vast.

1, 3. limited, narrow, confined. 3. parochial.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
extensive (ɪkˈstɛnsɪv)
1.  having a large extent, area, scope, degree, etc; vast: extensive deserts; an extensive inheritance
2.  widespread: extensive coverage in the press
3.  agriculture Compare intensive involving or farmed with minimum expenditure of capital or labour, esp depending on a large area of land
4.  physics Compare intensive of or relating to a property, measurement, etc, of a macroscopic system that is proportional to the size of the system: heat is an extensive property
5.  logic
 a.  of or relating to logical extension
 b.  (of a definition) in terms of the objects to which the term applies rather than its meaning

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

"vast, far-reaching;" c.1600 of immaterial, c.1700 of material things; from L.L. extensivus, from extensus, pp. of extendere (see extend). Related: Extensively.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
However, because of their extensive use and long half-life, human exposure
  remains widespread.
The orchestration of this extensive undertaking was definitely a team effort.
There are wonderful pine woods, and very extensive ranges of meadow land.
They built extensive cities and the structures that preceded the modern pyramid
  (more accurately called a temple mound).
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