The humorous post Treasure or Trash Heap? (Will Manley, American Libraries) has some gems of wisdom. Among them:
. . . it’s good to weed out the term “weeding.” A better name would be the “library collection refreshment program.”
Whatever you call it, it’s a good practice to make sure your collection doesn’t contain outdated, erroneous material. Be sure to read Will’s post for a good laugh or two.