Domesticity (noun): life inside a home: the activities of a family or of the people who share a home (Merriam-Webster)
Found on Page 50, paragraph 11 of “The Cottagette”–>”Don’t be foolish, child,” said Lois, “this is serious. What they care for most after all is domesticity. Of course they’ll fall in love with anything; but what they want to marry is a homemaker.”
I believe this word in the quote means that Lois was telling Malda that in order for Ford Matthews to love her or marry her, she would always have to be a woman that was fervently involved in the duties of a homemaker such as cooking, cleaning, washing clothes, and doing anything that involved the needs of the family.