say it: PRAH-pur
proper is an adjective meaning "marked by suitability or rightness or appropriateness". It carries 4 recorded senses.
having all the qualities typical of the thing specified
“wanted a proper dinner, not just a snack”
“he finally has a proper job”
limited to the thing specified
“the city proper”
“his claim is connected with the deed proper”
appropriate for a condition or purpose or occasion or a person's character, needs
“everything in its proper place”
“the right man for the job”
“she is not suitable for the position”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for proper come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.