The first division of meiosis is called a reduction division. This is because

the purpose of meiosis is to divide into four smaller cells.
the chromosomes are much more highly condensed than in mitosis.
the products of the first division are diploid but then they discard some chromosomes.
the number of chromosomes per cell stays the same after the first division.
the mother cell is diploid, but the products of the first division are haploid.