1. 
   Overpopulation
   Overpopulation is a generally undesirable condition where an organism`s numbers exceed the carrying capacity of its habitat. The term often refers to the relationship between the human population and its environment, the Earth, or smaller geographical areas such as countries. Overpopulation can res...
   Found op http://en.wikipedia.org/wiki/Overpopulation
   
   
2. 
   Overpopulation
   When a reduction in population size would increase output per head i.e. it is above the optimum population.
   Found op http://www.bized.co.uk/reference/glossary/index.htm?glosid=336
   
   
3. 
   overpopulation
   [n] - too much population
   Found op http://www.webdictionary.co.uk/definition.php?query=overpopulation
   
   
4. 
   overpopulation
   overspill noun too much population
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=overpopulation
   
   
5. 
   overpopulation
   (from the article `Germany`) West of the Elbe the basic problem was not landlessness but overpopulation. The aristocracy along the Rhine and the Danube was often willing to give ...
   Found op http://www.britannica.com/eb/a-z/o/42
   
   
6. 
   overpopulation
   overpopulation An excessive population of an area to the point of overcrowding with a depletion of natural resources, or environmental deterioration.
   Found op http://www.wordinfo.info/words/index/info/view_unit/1728/
   
   
7. 
   overpopulation
   Too many people for the resources available in an area (such as food, land, and water). The consequences were first set out by English economist Thomas Malthus at the start of the population explosion. Although there is often a link between overpopulation and population density, high densities do no...
   Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0034824.html
   
   
8. 
   overpopulation
   1) Overspill 2) Population
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/overpopulation/1
   
   

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