90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent. The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning. This is the British English definition of Mercator projection. View American English definition of Mercator projection. someone, especially a political leader, who actively encourages attitudes of optimism and hope for the world A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today. Definition and synonyms of Mercator projection from the online English dictionary from Macmillan Publishers Limited. Source.