Noun

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
2. A progression from simpler to more complex forms
3. A process of becoming larger or longer or more numerous or more important
4. Vegetation that has grown
5. The gradual beginning or coming forth
6. (pathology) an abnormal proliferation of tissue (as in a tumor)
7. Something grown or growing