multeity

From Latin multus (“much, many”).

multeity (usually uncountable, plural multeities)

1. (rare) manifoldness; multiplicity; the quality of being many.
   • 1821 May 4, Samuel Taylor Coleridge, [Letter beginning "Mr. and Mrs. Gillman's kind love […] "]; republished in Letters, Conversations, and Recollections of S. T. Coleridge, volume 1, as 'Letter 17', London: Edward Moxon, 1836, page 197:

     When the whole and the parts are seen at once, as mutually producing and explaining each other, as unity in multeity, there results shapeliness—forma formosa.

• (state or condition of being many): manyhood, multipleness; see also Thesaurus:manyness