Aviation Dictionary
ماده ای که ضریب نفوذ مغناطیسی آن بسیار ناچیز بوده بطوریکه بتوان آن را غیر مغناطیسی محسوب کرد
A material which has a magnetic permeability of less than one, less than that of a vacuum. A diamagnetic material is repelled by a magnet and will try to align itself across the lines of magnetic flux, rather than along them.