The scientific study of plants, a branch of biology. Typically those disciplines that involve the whole plant.
The plant life of a geographical area; flora.
The properties and life phenomena exhibited by a plant, plant type, or plant group.
A botanical treatise or study, especially of a particular system of botany or that of a particular place.
Any science involved in studying phenomena or laws of the physical world: physics, chemistry, biology, astronomy, and so on.