What is the definition of a dyne?

1)having to do with another, such as position or size
2)the study of the natural world and its laws
3)the application of energy to an object in order to move it
4)the small unit for measuring force; equal to the weight necessary to accelerate 1 gram at the rate of 1 cm per second squared
5)the larger SI unit of measuring force, equal to the force necessary to accelerate 1 kilogram at the rate of 1 meter per second squared

4)the small unit for measuring force; equal to the weight necessary to accelerate 1 gram at the rate of 1 cm per second squared