IPA: /ˈrɛdʒɪstəd/
KK: /ˈrɛdʒɪstərd/
Describing something that has been officially recorded or certified, often indicating that it meets certain standards or qualifications.
She is a registered nurse, which means she has completed the necessary training and certification.
Registered → It is formed from "reg" (from Latin "regere", meaning to rule or to direct) and the suffix "-ister" (from Latin "ista", meaning one who does). The word "registered" means to have been directed or ruled into a formal record or list.
Think of someone being 'directed' ('regere') into a formal record — that's why registered means officially recorded.