From Longman Business Dictionaryprime-1prime-1 /ˌpraɪm ˈwʌn/ noun [singular] FINANCE a RATING given by some CREDIT AGENCIES showing that the risk of non-payment of a loan etc is very low. Prime-1 is the best rating, followed by prime-2 and prime-3Moody’s assigned their top ratings — prime-1 and A-1-plus, respectively — to the government agency’s planned offering of commercial paper.
