BEST definition: of the highest quality, excellence, or standing. See examples of best used in a sentence. In February 2009, Best Buy leveraged its partnership with The Carphone Warehouse to launch Best Buy Mobile, a Best Buy-branded mobile retailer. Best Buy Mobile standalone stores were opened in shopping malls and urban downtowns. 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: 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. 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 Restaurants in Ninnescah Township, KS - Last Updated July 2026 - The Cornerstone of Clearwater, Armando's Mexican Grill, Brew'd Awakening, Boudreux's Burger Barn, Halagains, Getaway Lounge, Casey's, Woodfire Grille, Sandbox, Ginger Asian Cuisine Shop top deals and sales available at Best Buy today. Find offers on electronics on appliances, TVs, laptops, cell phones and more. 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. 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). 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.