"A maid, or housemaid or maidservant, is a female domestic worker. Although now usually found only in the most wealthy of households, in the Victorian era ...
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domestic service was the second largest category of employment in England and Wales, after agricultural work.
"Maid" in Middle English meant an unmarried woman, especially a young one, or specifically a virgin. These meanings lived on in English until recent times, alongside the sense of the word as a type of servant." - (en.wikipedia.org 26.11.2019)