Intraspecific competition is an interaction in population ecology, whereby members of the same species compete for limited resources. This leads to a reduction in fitness for both individuals. By contrast, interspecific competition occurs when members of different species compete for a shared resource. Members of the same species have very similar...
A type of competition whereby an individual plant competes with one or more members of the same species for nutrients, space, light, etc. ... (09 Oct 1997) ... 
competition between individuals of the same species (Ricklefs 1970:873).
competition between individuals of the same species (Ricklefs 1979:873).
competition between individuals of the same species (Ricklefs 1979873). 
Competition (for food, territories, mates, and so on) that occurs among members of the same species.
Competition between individuals of the same species in a community for resources.