MIR
n. countablen. a very old word for a world or a group of people living together. It was also the name of a famous space station that traveled around the Earth.
n. an archaic term for the world or the universe; historically, a self-governing community of peasants in pre-revolutionary Russia. When capitalised, it refers to the Soviet/Russian modular space station operated in low Earth orbit from 1986 to 2001.
The old stories speak of peace throughout the mir.
The cosmonauts spent several months conducting scientific experiments aboard the Mir space station.
In the traditional Russian village, the mir functioned as a communal system for land tenure and local administration among the peasantry.
In its historical Russian sense, it refers to a specific social structure. In its astronomical sense, it is a proper noun and should be capitalised.