Vitamin A deficiency: Related Medical Conditions. To research the causes of Vitamin A deficiency, consider researching the causes of these these diseases that may be similar, or associated with Vitamin A deficiency:
Definition of push button. : a small button or knob that when pushed operates something especially by closing an electric circuit.
The definition of a push is  the act of putting pressure on someone or something to get action. An example of a push is a potential employer offering a car allowance to sweeten a job offer. An example of a push is using a shove on the back of a sled to get it started downhill.