According to the EU definition, the answer is yes if 50% of the passing 75 microns is 1 to 100 nanometer in size. However, the definition of nano-materials has been controversial. Definitions based merely on size can become problematic when nano-sized particles are agglomerated and when a material has only a fraction of it in the nano size (such may be the case of the passing 75 microns). Also, regardless of size, materials made using nano-technology could be called nano-materials. Hence, some researchers are resorting to definitions based on the volume specific surface area and other concepts for better classification. The definition is thus evolving.

I agree with the points mentioned by Prof. Nehdi that definition of nano-materials is controversial.

The material having one of the least dimension below 100 nm falls under the category of nano material. The other dimension could be in nano or micron scale. As per my opinion, this is one of the mostly accepted definition across globe. For example, multi wall Carbon Nano Tube (CNT) usually have diameter below 100 nm and length in microns (sometimes around 1 mm which will be close to 1000 micron).

Dear Moncef L. Nehdi . thanks for answering