1. (informal) Capable of being peeked at or into.
    • 1972, New York Magazine (volume 5, number 31, page 45)
      Her fourteen dollhouses range in sophistication from a child-made primitive (1887) to an electrified manse set on a low table and peekable from all sides.
  2. (computing) Of a stream or other sequence: from which the next value can be retrieved without advancing the pointer from its current position.
    • 2012, John Hunt, Smalltalk and Object Orientation: An Introduction (page 130)
      Peekable streams also have an internal record of their current position and can look ahead in the stream for information.

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