Nudity or revealing clothing.
Broadly speaking, fanservice is anything which is included in a story because it makes the fans happy, but doesn't advance the plot or reveal anything about the characters. This could be catchphrases ("Ecchi na no wa ikenai to omoimasu!" - Mahoro), repetative humour, or awsome kickass fighting scenes (Naruto). But in practise, the word is almost exclusively used to mean female nudity.
Examples: Chobits, Love Hina, Ranma 1/2, Mahoromatic and Hanaukyo Maid Tai are known for having copious fanservice.
Foreign words and their possible meanings
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