Concerning the Middle High German language.

An ancestor to the modern (High) German language, spoken from 1050 to about 1500. Some linguists prefer to use 1350 as the end of the Middle High German period, calling the period from 1350 to 1650 Early New High German in a broad sense.

the period of life between youth and old age; midlife

of, or relating to middle age; neither old nor young

The full moon or the lunar month around midsummer.

24th June, an English quarter day.

Madness attributable to the heat of summer, or to the midsummer moon.

(idiomatic) A very remote place; a nondescript place lacking population, interesting things, or defining characteristics.

A dungheap. / A refuse heap usually near a dwelling. / (archaeology) A prehistoric pile of bones and shells. / (zoology) A shelter made of vegetation and other materials by packrats.

Halfway through a term, or roughly so.