marchioness

[mahr-shuh-nis, mahr-shuh-nes] /ˈmɑr ʃə nɪs, ˌmɑr ʃəˈnɛs/
noun, British
1.
marquise (defs 1, 2).
Origin
1770-80; < Medieval Latin marchiōnissa, equivalent to marchiōn- (stem of marchiō) marquis + -issa -ess
Usage note
See -ess.
British Dictionary definitions for marchioness

marchioness

/ˈmɑːʃənɪs; ˌmɑːʃəˈnɛs/
noun
1.
the wife or widow of a marquis
2.
a woman who holds the rank of marquis
Word Origin
C16: from Medieval Latin marchionissa, feminine of marchiōmarquis
Word Origin and History for marchioness
n.

16c., from Medieval Latin marchionissa, fem. of marchio "marquis," from marca (see marquis (n.)).