disjunction

The act of disjoining; disunion, separation.

The state of being disjoined, contrasting, or opposing.

(logic) The proposition resulting from the combination of two or more propositions using the or operator.

(mathematics) A logical operator that results in “true” when some of its operands are true.

(biology) During meiosis, the separation of chromosomes (homologous in meiosis I, and sister chromatids in meiosis II).