Greatest in amount, extent, or degree: has the most compassion.
In the greatest number of instances: Most fish have fins.
n.
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!
pron. (used with a sing. or pl. verb) The greatest part or number: Most of the town was destroyed. Most of the books were missing. adv.
Superlative of much.
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.
[Middle English, from Old English mǣst, māst; see mē-3 in Indo-European roots. Adv., sense 3, short for almost.]
(mōst) 