T/V usage. what does "co-ed" mean in this context?
The camaraderie of the Italian male, incidentally, is extended to the Italian female; unlike the French or German student, the Italian says Tu to the co-ed almost as readily as to the male fellow student.

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"Co-ed" is short for co-educational; it means that men and women attend the same university and/or share the same dormitory.  Often female students are called "co-eds" (for some strange reason, they don't call male students this name).