Greatest in number: won the most votes. Greatest in amount, extent, or degree: has the most compassion. In the greatest number of instances: Most fish have fins. The greatest amount or degree: She has the most to gain. Slang The greatest, best, or most exciting. Used with the: That party was the most! The greatest part or number: Most of the town was destroyed. Most of the books were missing. In or to the highest degree or extent. Used with many adjectives and adverbs to form the superlative degree: most honest; most impatiently. Very: a most impressive piece of writing. Informal Almost: Most everyone agrees. at (the) most At the maximum: We saw him for ten minutes at the most. She ran two miles at most.