industrisemester

Etymology
. According to SO attested since 1950.

Noun

 * 1) A general industrial holiday; a period of time when the industrial sector (either wholly or partly) of a country go on vacation.

Usage notes
In Sweden this has traditionally most often occurred during the month of July, and later including August. It is less prevailing today, due to new production methods and globalization requiring companies to keep their operations running all year round.