Learn the meaning, usage, and synonyms of the word highest , which can be an adjective, adverb, or noun. Find out how to say highest in different languages and contexts, such as music, sports, or weather. Synonyms for HIGHEST : higher, top, upper, first, loftiest, topmost, uppermost, upmost; Antonyms of HIGHEST : lowest, lower, lowermost, under, underneath, below ... highest definition: greatest in degree or amount. Check meanings, examples, usage tips, pronunciation, domains, and related words. Discover expressions like " highest point", "at its highest pitch", "to the highest degree". The meaning of HIGH is rising or extending upward a great distance or a distance greater than others of its kind : taller than average, usual, or expected. How to use high in a sentence. Synonym Discussion of High.