least
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(a) 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
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(r) used to form the superlative
- The garter snake is the least dangerous snake
Nouns
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(n) something that is of no importance
- it is the least I can do
- that is the least of my concerns