Look up the meanings of words, abbreviations, phrases, and idioms in our free English Dictionary. Biology Dictionary is the largest dictionary of biology terms that you can easily access online. biology definition: 1. the scientific study of the natural processes of living things: 2. the scientific study of the…. advanced translate: de pointe, avancé/-ée, avancé/-ée, avancé, supérieur. It is broken down into many fields, reflecting the complexity of life from the atoms and molecules of biochemistry to the interactions of millions of organisms in ecology.