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

plural of modus operandi

present participle of co-operate

simple past tense and past participle of cooperate

Third-person singular simple present indicative form of co-operate

plural of operant

Able to be operated or used / Able to be put into operation; practicable / Able to be treated by surgery

In an operatic manner.

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.