[Definition] A group of conspecific individuals that is demographically, genetically, or spatially disjunct from other groups of individuals. [Term] 
Population
S p e c i e s p o p u l a t i o n
M e t a p o p u l a t i o n
P o p u l a t i o n
A g g r e g a t i o n
D e m e
L o c a l p o p u l a t i o n
S u b p o p u l a t i o n