proper
/ˈprɒpər/ adjective
CORRECT [always before noun] › correct or suitable: the proper way to do something Please put those books back in the proper place. REAL [always before noun] mainly UK › real and satisfactory: his first proper job You should eat some proper food instead of just sweets. ACCEPTABLE › socially acceptable: It's not proper to interrupt someone when they're speaking.
MAIN [always after noun] › referring to the main or most important part of something: I live outside Cambridge - I don't live in the city proper.