1. The act or process of dislocating or the state of having been dislocated: "the severe emotional dislocation experienced by millions of immigrants ... who were forced to separate themselves forever from the ... circle of people and places on which they had depended" (Doris Kearns Goodwin).

2. Displacement of a body part, especially the temporary displacement of a bone from its normal position.

3. Chemistry An imperfection in the crystal structure of a metal or other solid resulting from an absence of an atom or atoms in one or more layers of a crystal.

4. Geology See displacement.