(psychiatry, chiefly in the plural) Any of a set of influential psychiatric diagnostic criteria developed from the late 1950s to the early 1970s.

(mathematics) A necessary and sufficient criterion to determine whether a Hermitian matrix is positive-definite: specifically, when all of the leading principal minors have a positive determinant.

(mathematics) A particular statement about the positivity of a certain sequence that is equivalent to the Riemann hypothesis.

A criterion used by urban planners and architects to assess how comfortable the wind around buildings is for pedestrians (a wind comfort assessment). Commonly used in urban planning in the United Kingdom.