(mathematics) The sequence in which the various operations in a mathematical expression are to be evaluated.

plural of operating system

Any simple step in a multi-step chemical engineering process; examples include distillation, evaporation, mixing, filtration, crystallization etc.

present participle of co-operate

Alternative spelling of cooperatively

plural of binary operation

(arithmetic, computing) Any one of the four basic operations in arithmetic: addition, subtraction, multiplication or division; any one of said operations as implemented on a computer.

(algebra) An operation taking two operands.

(algebra, computing) A symbol representing unary operation; an operator taking one operand.

(set theory) A mathematical operation that returns a set taking one or more sets as input.