Emily Dickinson Lexicon

MOST, n. [used as a substitute for a noun, when the noun is omitted or understood.]

1. The greatest number or part. Then he began to upbraid the cities wherein most of his mighty works were done. Matth. xi. [This use seems to have resulted from the omission of part, or some similar word, and most in this case signifies greatest, that is, the greatest part.]
2. The most, the greatest value, amount or advantage, or the utmost in extent, degree or effect. A covetous man makes the most of what he has, and can get. L'Estrange. At the most, the greatest degree or quantity; the utmost extent. Stock brings six per cent. interest at the most, often less.