adjective smallest in size, amount, degree, etc.
adverb used to indicate the smallest amount or degree
In mathematics, 'least' is used to refer to the smallest or minimum value in a set of numbers.
In statistics, 'least' is used in terms like 'least squares' which refers to a method for finding the best-fitting line through a set of data points.
In engineering, 'least' is used in terms like 'least amount of material' or 'least energy consumption' to indicate optimization for minimal usage.
In economics, 'least' is used in terms like 'least cost' or 'least expensive' to indicate the lowest cost or price.
In computer science, 'least' is used in algorithms and data structures to refer to the smallest element or value.
In the context of writing, 'least' may be used to refer to the smallest amount or degree of something, such as the least important character in a story.
Psychologists may use 'least' when discussing the least severe symptoms or the least effective treatment options for a particular mental health issue.
Accountants may use 'least' when referring to the least profitable client or the least valuable asset on a company's balance sheet.
Engineers may use 'least' to describe the least efficient design option or the least reliable component in a system.
Lawyers may use 'least' to discuss the least favorable outcome for a client or the least persuasive argument in a case.