Biological term for directional growth or movement of an organism in response to an external stimulus, such as light or gravity.
The growth of plants toward light is called phototropism.
introversion
extroversion
direction; trend; course of action · directionality; directivity; orientation · goal; aim
proactive
bidirectionality; interactivity
Composed of 向 (direction, facing) and 性 (nature, property), literally 'directional property'. The term is a modern scientific coinage for 'tropism'.