PR is an abbreviation for proportional representation.
pr in British English1
abbreviation for
1. Word forms: pluralprs
pair
2.
paper
3.
(in prescriptions) per rectum
4.
power
Word origin
(sense 3) Latin: through the rectum; to be inserted into the anus
pr in British English2
the internet domain name for
Puerto Rico
Puerto Rico in British English2
(ˈpwɜːtəʊ ˈriːkəʊ, ˈpwɛə-)
noun
an autonomous commonwealth (in association with the US) occupying the smallest and easternmost of the Greater Antilles in the Caribbean: one of the most densely populated areas in the world; ceded by Spain to the US in 1899. Currency: US dollar. Capital: San Juan. Pop: 3 674 209 (2013 est). Area: 9104 sq km (3515 sq miles)
Former name (until 1932): Porto Rico. Abbreviation: PR