systems Definition

a regularly interacting or interdependent group of items forming a unified whole : such as

a group of interacting bodies under the influence of related forces

an assemblage of substances that is in or tends to equilibrium

the act, process, or profession of studying an activity (such as a procedure, a business, or a physiological function) typically by mathematical means in order to define its goals or purposes and to discover operations and procedures for accomplishing them most efficiently

the basic system of antigens of human blood behaving in heredity as an allelic unit to produce any of the ABO blood groups

a part of the vertebrate nervous system that innervates smooth and cardiac muscle and glandular tissues and governs involuntary actions (such as secretion and peristalsis) and that consists of the sympathetic nervous system and the parasympathetic nervous system

a system for identifying persons based on bodily measurements, photographs, and notation of data (such as markings, color, and thumb line impressions)

binary star; also : a similar system containing bodies (such as black holes) other than stars

an arrangement in which two individuals are paired (as for mutual safety in a hazardous situation)

a system of teaching law in which instruction is chiefly on the basis of leading or selected cases as primary authorities instead of from textbooks —called also case method

the part of the nervous system which in vertebrates consists of the brain and spinal cord, to which sensory impulses are transmitted and from which motor impulses pass out, and which coordinates the activity of the entire nervous system

the system of blood, blood vessels, lymphatics, and heart concerned with the circulation of the blood and lymph