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Seriatim is a Latin word which means "one after another" as in a series. Ad seriatim means it was discussed one by one in order. For example, a person filing suits ad seriatim; judges delivering pinions seriatim. When several issues are discussed in a case, court answers issues in a certain order in which the issues were originally presented to the court.
A seriatim opinion is delivered by a court with multiple judges, when each judge gives his/her opinion.