A Midgardian is a Earth dweller also know as humans. This is because in Norse mythology there are 9 Realms, and Earth is named Midgard so people that live there are called Midgardians.
a unit of measurement for determining the height of a midget. 1 midgetal is equal to 1.4 feet. 40 centimeters or 16 inches.
Also can be used for determining distance
In Norse myth, the defensivefortress which the gods build about the middle portion of the earth allotted to men in order to protect mankind from the giants. Midgard ("middle world") is on the same level as Nidavellir (land of the dwarfs), Svartalfheim (land of the dark elves/dwarfs) and Jotunheim (the land of the giants).