It is defined as a material or a substance which does not exhibit any properties of a magnet. So, it cannot be influenced by other magnetic material. Eg - Plastic, Coal etc.
well the substance which r not atracted by a magnet is called non magnetic substance
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Sayantani answered this
Materials that are not attracted by magnets are called non-magnetic materials. Modern coins are made of uniform mixtures of different metals so they become non- magnetic. Examples of non-magnetic materials include rubber, coins, feather and leather.