extendable

/ɪkˈstɛndəbəl/
adjective
  1. Able to be made longer or larger, either physically or in terms of time.
    • The dining table has an extendable leaf that seats two more people.
    • We signed an extendable lease that allows us to stay another year.
    • The ladder is extendable, so it can reach the second-story roof.
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