What does "pocket money" mean?

Also, spending money. Cash for incidental or minor expenses, as in They don't believe in giving the children pocket money without asking them to do chores, or Can I borrow a dollar? I'm out of all my spending money. The first term, dating from the early 1600s, alludes to keeping small sums in one's pocket; the second alludes to money that may be spent (as opposed to saved) and dates from the late 1500s.