Bydgoszcz District (Polish: Rejencja Bydgoska, German Regirugnsbezirk Bromberg) was the northern of two administrative districts of the Grand Duchy of Poznan (1815-1918) later also called the Province of Poznań (1849-1918).
The expression since then has only been used in this extremely pejorative sense; no government or organization has used it to describe its own facilities, using instead terms such as internment camp, resettlement camp, detention facility, etc, regardless of the actual circumstances of the camp, which can vary a great deal.
a camp where non-combatants of a district are accommodated, such as those instituted by Lord Kitchener during the South African war of 1899-1902; one for the internment of political prisoners, foreign nationals, etc., esp. as organized by the Nazi regime in Germany before and during the war of 1939-45
In the English-speaking world, the term "concentration camp" was first used to describe camps operated by the British in South Africa during the 1899-1902 Second Boer War.