(mathematics) The condition of being noncommutative.

(transitive) To feather, as an arrow.

(rare) The statistical and psychological observation that a person is prone to prefer Coca-Cola over Pepsi when they have labels, but prone to prefer Pepsi over Coca-Cola when they are unlabelled.

An apparatus for impregnating with, or exposing to the action of, sulphur, especially for purposes of fumigation or bleaching.