When we define language we have to be careful not to exclude symbols, gestures,or motions. This is because if we exclude these from our definition, we will be denying the language of the deaf community.
All human languages share basic characteristics, some of which are organizational rules and infinite generativity.
Infinite Generativity is the ability to produce an infinite number of sentences using a limited set of rules and words. ( Santrock,& Mitterer,2001)