n. Agent noun of fix; one who, or that which, fixes.n. A chemical (sodium thiosulfate) used in photographic development that fixes the image in place, preventing further chemical reactions.n. A person who arranges immunity for defendants by tampering with the justice system via bribery or extortion, especially as a business endeavor for profit.n. A person who assists foreign journalists in volatile countries, they often provide interpretation, personal connections, and transportation as a service.