British slang for "immigrant from Pakistan," 1964, a shortening of Pakistani. Pak for Pakistan is attested by 1954.
also PC; as an abbreviation for personal computer, by 1978; as an abbreviation for politically correct, by 1990. It also has stood for Privy Councilor and police constable, among other things.
"a consideration or argument in favor," c. 1400, from Latin pro (prep.) "on behalf of, in place of, before, for, in exchange for, just as" (from PIE root *per- (1) "forward," hence "in front of, before, first, chief"). Pro and con is short for pro and contra (c. 1400) "for and against" (Latin pro et contra).