The term BIT SLIGHTEST can be broken down into three crossword solutions: IOTA (4 letters), TRACE (5 letters), and LEAST (5 letters). IOTA is a Greek letter, the ninth in the alphabet. It is often used to represent a very small amount or quantity. TRACE is a verb meaning to follow or find the course of something, such as a path or a trail. LEAST is an adjective meaning the smallest amount or degree possible. Together, these three words form the phrase 'bit slightest, ' which means the smallest amount or degree possible.