[mey-truh-ney-lee-uh, -neyl-yuh, ma-]
noun, plural Ma·tron·al·i·al·i·a, Ma·tron·al·i·al·i·as. (sometimes used with a plural verb)
  1. an annual festival of ancient Rome held by matrons in honor of Juno.

Origin of Matronalia

1700–10; < Latin Mātrōnālia (festa), neuter plural of mātrōnālis of, belonging to a married woman. See matron, -al1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for matronalia

Historical Examples of matronalia