What is the meaning of Propre?

Obsolete form of proper.

inflection of proper:

1. definite singular
2. plural

definite singular

plural

own

clean

toilet-trained

house-trained

proper, specific, particular [with à ‘to’]

eigen-

clean

(one's) own

proper, appropriate, correct

special

definite natural masculine singular of proper

Source: wiktionary.org