What is meant by saturation in chemistry , physics and biology?

DEFINITION IN CHEMISTRY :- The state of  a compound or a solution that is fully saturated is called saturation.

DEFINITION IN PHYSICS :- A state of ferromagnetic substance in which an increase in applied magnetic field strength does not                                       produce an increase in magnetization is called saturation.

DEFINITION IN BIOLOGY :- 

1.) In mutation studies, the observed no of mutations relative to the maximum amount posssible (usually undefined)

2.) Oxygen Saturation - A clinical measure of the amount of oxygen in a patient blood