the staying of the exercise of federal jurisdiction in a case that involves a question of state law or policy which the federal court prefers to have resolved by a state court or agency
an abstention grounded on the involvement in the federal case of a challenge to the exercise of a usually complex state administrative function
Col·o·ra·do Riv·er abstention
[kÄ -lə-ra-dō-, -rÄ -]
an abstention grounded esp. on the involvement in the federal case of questions of state concern that are also at issue in a parallel case in state court
an abstention grounded on the involvement in the federal case of the interpretation of an ambiguously worded state law whose constitutionality would have to be determined by the federal court NOTE: A party to a case subjected to a Pullman abstention may reserve the right to return to federal court once the state court has resolved the state law question. Pullman abstentions are the most common type of abstention.
an abstention grounded on the involvement in the federal case of an issue that greatly affects and concerns a state
an abstention grounded on the plaintiff's invocation of federal jurisdiction for the purpose of restraining an ongoing usually criminal state proceeding that has been brought in good faith and not for harassment