Meaning of least

(adj) the superlative of `little' that can be used with mass nouns and is usually preceded by `the'; a quantifier meaning smallest in amount or extent or degree; "didn't care the least bit"; "he has the least talent of anyone"

(adv) used to form the superlative; "The garter snake is the least dangerous snake"

(noun) something that is of no importance; "it is the least I can do"; "that is the least of my concerns"