The crossword solutions for the term THE GREATEST are ALI, IAM, and NTH. Muhammad Ali, also known as 'The Greatest, ' was an American professional boxer, activist, and philanthropist. He is widely regarded as one of the most significant and celebrated sports figures of the 20th century. IAM is an acronym for 'I Am, ' a phrase used to refer to oneself. NTH is an abbreviation for 'the greatest, ' which is a superlative form of the adjective 'GREAT.' Together, these three solutions form the phrase 'I Am The Greatest, ' which is a famous quote attributed to Muhammad Ali.