ladder -
A frame, usually portable, of wood, metal, or rope, used for ascent and descent, consisting of two side pieces to which are fastened cross strips or rounds forming steps.
ladder -
To ascend a building or wall using a ladder.
ladder -
To develop a ladder as a result of a broken thread.
Wikipedia
A ladder is a vertical or inclined set of rungs or steps. There are two types: rigid ladders that can be leaned against a vertical surface such as a wall, and rope ladders that are hung from the top. The vertical members of a rigid ladder are called stringers (US) or stiles (UK).
OmegaWiki Dictionary
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ladder A frame usually portable, of wood, metal, or rope, for ascent and descent, consisting of two vertical side pieces to which are horizontally fastened cross strips or rounds forming steps.