From Longman Dictionary of Contemporary Englishtop-rankingˌtop-ˈranking adjective [only before noun] HIGH POSITION OR RANKmost powerful and important within an organization top-ranking diplomats
Examples from the Corpus
top-ranking• The nation's top-ranking artists provided works for public places.• The Profitboss identifies Marilyn McGregor as the top-ranking customer service engineer, highlighting the stream of compliments she gets from the field.From Longman Business Dictionarytop rankingˌtop ˈranking noun [countable, uncountable]1the best or top position in an industry, organization etc, in relation to other industries or organizationsThe university’s Department of Design received top ranking in the latest report.2computing a very high position in the list of websites that a search engine gives you when it searches the Internet for informationOur service will result in top ranking of your website for targeted keywords. —top-ranking adjective [only before a noun]top-ranking Western firmsCompare your web pages against competitors and top-ranking sites. 