adjustable

adj

1. Capable of being adjusted.
2. (usually)Capable of being adjusted.

   “Another feature new to British Railways is the provision of two-position adjustable seats in the first class compartments. In this design, the seat squab can be pulled out some six inches, the seat back being attached to the seat to give a less upright sitting position.”

noun

1. Anything that can be adjusted.
2. (abbreviation, alt-of, ellipsis, often)Anything that can be adjusted.

   “"He came in. He had a gun. He was crazy. You can see he was crazy; look what he did to Ricky. He thought Ricky was me. He wanted to steal my adjustables. Look." Sonny smiled and tilted the steel case so Henry could look at the jumble of rusty ironmongery inside.”