disjunction

(dĭs-jŭngkˈshən)

1. The act of disjoining or the condition of being disjointed.
2. Logic
   a. A proposition that presents two or more alternative terms, with the assertion that only one is true.
   b. A proposition that presents two or more alternative terms, with the assertion that at least one is true.
3. Genetics The separation of homologous chromosomes during meiosis.