Most of the opinions you read as a law student are “majority” opinions. When a group of judges get together to decide a case, they vote on which side should win and also try to agree on a legal rationale to explain why that side has won. A majority opinion is an opinion joined by the majority of judges on that court. Although most decisions are unanimous, some cases are not. Some judges may disagree and will write a separate opinion offering a different approach. Those opinions are called “concurring opinions” or “dissenting opinions,” and they appear after the majority opinion. A “concurring opinion” (sometimes just called a “concurrence”) explains a vote in favor of the winning side but based on a different legal rationale. A “dissenting opinion” (sometimes just called a “dissent”) explains a vote in favor of the losing side.
(Orin S. Kerr, “How to Read a Legal Opinion: A Guide for New Law Students,” The Green Bag, 2d ser., 11 [autumn 2007]: 51-63, at 54)

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