What does the word alternately mean?

Usage examples for alternately

  1. The shelves are disposed in compartments, alternately wide and narrow, the former being set slightly in advance of the latter, so as to break the monotony of a bookcase of uniform width extending the whole length of a long room. – The Care of Books by John Willis Clark
  2. In a day or two he went home, and I thought no more about him, until Tom, who had been to the post- office, brought Mabel a letter, which made her turn red and white alternately, until at last she cried. – Homestead on the Hillside by Mary Jane Holmes
  3. Knit and rib 3 stitches alternately for 3 rounds. – The Ladies' Knitting and Netting Book by Miss Watts