Dissenting opinion
No. If a Supreme Court justice disagrees with the decision and wants to make his or her opinion a matter of public and judicial record, the justice must write a dissenting opinion.For more information, see Related Questions, below.
Five or more justices who agree on a decision form a majority. The written decision is sometimes called the "majority opinion," but is officially known as the "opinion of the Court" to signify its importance.
The Chief Justice's decision on a case carries the same weight as the other justices. And yes, it must be a majority opinion for the ruling to stand, but the Chief Justice does not have to agree.
YES AS LONG AS THE MAJORITY AGREE.
Because more or majority of people agree with the decision.
A decision or opinion to which most justices agree may be called a "majority decision" or "majority opinion". When a majority agreeing to a single point-of-view issues a unified written decision, the term is "opinion of the Court."
A rule of the majority is called "majority rule". It is a principle that a decision is made by a vote in which more than half of the members of the group agree.
....disagrees with the majority opinion, and explains his legal rationale for doing so.
Not by himself. The Chief Justice has different responsibilities from the Associate Justices, but has no more voting power than they do. In order to reach a decision on any case, including one that overturns a previous US Supreme Court ruling, a simple majority of the Justices must agree on a verdict.
The Court's Opinion is synonymous with the Court's decision, and usually refers to the majority opinion. The "Opinion of the Court" gives the verdict and explains the reasoning behind the decision reached. The privilege of writing the official opinion falls to the most senior justice in the majority group, or to the Chief Justice if he (or she) voted with the majority; this person may choose to write the opinion, or may assign the task to another member of the majority. If the justices who voted against the majority wish to issue a unified opinion, they simply decide amongst themselves who will write it. Individual justices may write their own opinions, regardless of whether they agree with the majority. Justices may also "join" or sign any other written opinion they agree with, even if they agree with more than one point-of-view. This generally strengthens the opinion.
It is a concurring opinion. If there is no disagreement with the basis, the justice is included in the "majority opinion." In some cases, concurring opinions can become plurality decisions.
majority verdict The verdict of a jury reached by a majority. The verdict need not be unanimous if there are no fewer than 11 jurors and 10 of them agree on the verdict or if there are 10 jurors and 9 of them agree on the verdict