1. (biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level Noun
2. A progression from simpler to more complex forms Noun
3. A process of becoming larger or longer or more numerous or more important Noun
4. Vegetation that has grown Noun
5. The gradual beginning or coming forth Noun
6. (pathology) an abnormal proliferation of tissue (as in a tumor) Noun