What is the meaning of Least?

Chiefly preceded by the: superlative form of little: most little.

Chiefly used with abstract nouns: less than all others in extent or size; littlest, smallest.

Of two or more animals or plants with the same name: the smaller or smallest.

Lowest in importance or status; most insignificant or unimportant.

Followed by an agent noun: of a person: who does some action to the smallest degree.

Chiefly preceded by the: superlative form of little: most little.

2. Smallest in amount or extent.

   Smallest in amount or extent.

   Followed by a plural noun: the smallest number of; the fewest.

   Any, no matter how small in amount or extent.

   In a degree below all others; in the lowest or smallest degree.

   Used to form superlatives of adjectives, especially those that do not form the superlative by adding -est.

   Preceded by the: superlative form of little: most little; the lowest-ranking or most insignificant person or group of people.

   Something of the smallest possible extent; an indivisible unit; a minimum.

   Chiefly preceded by the: superlative form of little: most little; the smallest amount or extent of something.

   At least.

   passive infinitive of le

   passive infinitive of lea

   Source: wiktionary.org