From Longman Dictionary of Contemporary Englishstepladderstep‧lad‧der /ˈstepˌlædə $ -ər/ noun [countable] 
Da ladder which has two sloping parts that are joined at the top so that it can stand without support, and which can be folded flat
Da ladder which has two sloping parts that are joined at the top so that it can stand without support, and which can be folded flatExamples from the Corpus
stepladder• Two bags of cement were parked behind the fence, and a stepladder there, leading to the top.• In the next scene, Scottie tries to climb a stepladder.• The Volvo, whose windows wind down to reveal plush red curtains, is surrounded by stepladders.• Each slice was glue-sprayed and bundled up a pair of stepladders to be stuck into place.• On the landing he noticed a piece of paper lying on the floor between the stepladder and the wall. 