Webster's English Dictionary

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least

1. least \'le-st\ aj [ME leest, fr. OE l-st superl. of l-s] less 
   1: lowest in importance or position  2a: smallest in size or degree  2b: 
   being a member of a kind distinguished by diminutive size {~ b ittern} 2c: 
   smallest possible : SLIGHTEST 
2. least n : one that is least  1: at the minimum  2: in any case  - at 
   least 
3. least av : in the smallest or lowest degree