From Longman Dictionary of Contemporary EnglishLivingstone, Dr DavidDr David LivingstoneLiv‧ing‧stone, Dr David /ˈlɪvɪŋstən, -stəʊn/(1813–73) a Scottishmissionary (=someone who goes to a foreign country to teach people about Christianity) and explorer of Africa. He was the first European to see the zambeziRiver and the victoria falls. A journalist called Henry Morton stanley, who did not know Livingstone, went to look for him. When they met he said, ‘Dr Livingstone, I presume’. People sometimes say this as a joke when they meet someone.