en·gi·neer / ˌenjəˈni(ə)r/ • n. a person who designs, builds, or maintains engines, machines, or public works. ∎ a person qualified in a branch of engineering, esp. as a professional: aeronautical engineer. ∎ the operator or supervisor of an engine, esp. a railroad locomotive or the engine on an aircraft or ship. ∎ a skillful contriver or originator of something: the prime engineer of the approach.• v. [tr.] design and build (a machine or structure): the men who engineered the tunnel. ∎ skillfully or artfully arrange for (an event or situation) to occur: she engineered another meeting with him. ∎ modify (an organism) by manipulating its genetic material: genetically engineered plants.