Etymology
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banns (n.)

"proclamation or notice given in a church of an intended marriage," mid-15c. (late 12c. in Anglo-Latin), from Old English bannan "to summon, command, proclaim" (see ban (v.)). Also probably partly from Old French ban "announcement, proclamation, banns, authorization," from Frankish *ban or some other Germanic cognate of the Old English word. They were made part of ecclesiastic legislation 1215 by the fourth Lateran council.

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Definitions of banns

banns (n.)
a public announcement of a proposed marriage;
From wordnet.princeton.edu