central nervous system

nervous system

central, pivotal

the force by which the body revolving at a center is away from the center

angle formed at the center of the circle

a force that attracts a body towards the center of earth, or towards any other body, gravitational force, gravity

tribal system

immune system

the limbic system, the part of the brain involved in our behavioural and emotional responses

economic system

decimal system

outmoded set-up, system or order

habit, way of life, disposition, custom, practice, conduct

polyandry

(Biology) the natural management of cells

Reproductive system.

system of education or instruction

feudalism, feudal system