ex-tension ladder

extension ladder

noun
a ladder having two or more sections joined by a sliding mechanism that allows the ladder to be extended to the total length.

Origin:
1870–75

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
extension ladder

noun
a ladder whose length can be extended 
WordNet® 3.0, © 2006 by Princeton University.
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