Expectation was a belief or idea about what would likely happen.
In 2368, Worf's spinal cord was crushed and he was left paralyzed. Doctor Beverly Crusher welcomed Captain Jean-Luc Picard to visit Worf in sickbay, but told him not to expect a lot of conversation as Worf was in "full Klingon mode;" honorable, strong, and closed-minded. (TNG: "Ethics")