The adj proper has 4 senses (first 3 from tagged texts)
1. (34) proper -- (marked by suitability or rightness or appropriateness; "proper medical treatment"; "proper manners")
2. (2) proper -- (limited to the thing specified; "the city proper"; "his claim is connected with the deed proper")
3. (2) proper, right, suitable, suited -- (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"; "he is not a suitable husband for her")
4. proper -- (having all the qualities typical of the thing specified; "wanted a proper dinner; not just a snack"; "he finally has a proper job")