In other words, it is defined giving the concentration of each component.
Because there are different ways to define the concentration of a component, as a consequence there are also different ways to define the composition of a mixture.
Chemical composition, also known as chemical makeup or simply, composition, is a concept in chemistry that has different, but similar, meanings if referred to a single pure substance or a mixture.
The chemical composition of a mixture can be defined as the distribution of the single substances that constitute the mixture, called "components".
Having recently purchased Sims: Future, I can turn online dating ON and OFF. When I go back to my [present day] home, it won't shut off.