1. In a most excellent way; most creditably or advantageously. 2. To the greatest degree or extent; most: He was certainly the best hated man in the ship (W. Somerset Maugham). BEST definition: of the highest quality, excellence, or standing. See examples of best used in a sentence. Someone's best is the greatest effort or highest achievement or standard that they are capable of. Miss Blockey was at her best when she played the piano. One needs to be a first-class driver to get the best out of that sort of machinery. Use the Best Buy store locator to find stores in your area. Then, visit each Best Buy store's page to see store hours, directions, news, events and more. Best Dining in Baltimore, Maryland: See 70,726 Tripadvisor traveler reviews of 2,296 Baltimore restaurants and search by cuisine, price, location, and more. Explore the definition of the word best, as well as its versatile usage, synonyms, examples, etymology, and more. In the best of all possible worlds, no one would be without food and clean water. I have a wonderful family and a great job, so I feel that I have the best of both worlds. Idioms (all) for the best, producing good as the final result: It turned out to be all for the best when I didn't get that job. Idioms as best one can, in the best way possible: As best I can tell, we're the first ones here. Shop Best Buy for electronics, computers, appliances, cell phones, video games & more new tech. Store pickup & free 2-day shipping on thousands of items. best adjective, adverb (HIGHEST QUALITY) of the highest quality, to the greatest degree, in the most effective way, or being the most suitable or pleasing; superlative of good orwell.