Real Dictionary

moon
The moon is the object that you can often see in the sky at night. It goes round the Earth once every four weeks, and as it does so its appearance changes from a circle to part of a circle.

moon in American English
the celestial body that revolves around the earth from west to east in c. 271⁄3 days with reference to the stars and once in c. 291⁄2 days with reference to the sun, and that accompanies the earth in its yearly revolution about the sun: diameter, c. 3,476
to behave in an idle, dreamy, or abstracted way, as when in love
to pass (time) in mooning
noun: the earth's natural satellite, orbiting the earth at a mean distance of 238,857 miles (384,393 km) and having a diameter of 2160 miles (3476 km)

moon in British English
noun: the natural satellite of the earth. Diameter: 3476 km; mass: 7.35 × 1022 kg; mean distance from earth: 384 400 km; periods of rotation and revolution: 27.32 days

Moon in British English 1
noun: a system of embossed alphabetical signs for blind readers, the fourteen basic characters of which can, by rotation, mimic most of the letters of the Roman alphabet, thereby making learning easier for those who learned to read before going blind

Moon in British English 2
noun: William. 1818–94, British inventor of the Moon writing system in 1847, who, himself blind, taught blind children in Brighton and printed mainly religious works from stereotyped plates of his own designing