“ban” is a noun and verb with 9 meanings. Its most common meaning is: a decree that prohibits something.
ban
noun
a decree that prohibits something
100 bani equal 1 leu in Moldova
100 bani equal 1 leu in Romania
an official prohibition or edict against something
a bachelor's degree in nursing
verb
forbid the public distribution of ( a movie or a newspaper)
prohibit especially by legal means or social pressure
“Smoking is banned in this building”
ban from a place of residence, as for punishment
expel from a community or group
Source: WordNet 3.1, Princeton University