¹ best adjective

• better than all others in quality or value
• most skillful, talented, or successful
• most appropriate, useful, or helpful

² best adverb

• in the best way : in a way that is better than all others : with the most success or benefit
• to the greatest degree or extent : most

³ best noun

• the best person or thing : the best group of people or things
• someone's or something's most effective, capable, or successful condition—used in phrases like at your best and at its best
• the highest level that you can do or achieve

⁴ best verb

• to do better than (someone or something) : to defeat or outdo (someone or something)