1.
maid, housemaid
A female domestic servant who cleans and does household work. From English "maid."
2.
maid cafe worker, maid (subculture)
A worker at a maid cafe, dressed in a maid costume and providing a themed hospitality experience. Part of Japanese otaku subculture, especially associated with Akihabara.
Usage
Sense 1 refers to the traditional meaning of a domestic servant, used when discussing Western households or historical settings. Sense 2 reflects modern Japanese pop culture, where メイド is strongly associated with 秋葉原 (Akihabara) and otaku culture.
Cultural note
メイド喫茶 (maid cafes) became a cultural phenomenon in the early 2000s. Staff wear elaborate maid costumes and interact with customers using theatrical hospitality, addressing them as ご主人様 (master) or お嬢様 (milady).