IPA: /ˌriː.kɒn.sənˈtreɪ.ʃən/
KK: /ˌriːkɒnsənˈtreɪʃən/
The process of gathering or moving people into a specific area, often for political or military reasons, such as relocating rural populations to towns.
During the war, the government implemented a policy of reconcentration to control the population more effectively.
Reconcentration → It is formed from "re-" (meaning again) and "concentration" (from Latin "concentrare", meaning to bring together). The word refers to the act of concentrating again or reassembling something that has been dispersed.
Think of 'again' ('re-') and 'bringing together' ('concentrare') to remember that 'reconcentration' means to concentrate something once more.