1A person who designs, builds, or maintains engines, machines, or structures.

1.1 A person qualified in a branch of engineering, especially as a professional.
‘an aeronautical engineer’

2.1North American A train driver.

1Design and build (a machine or structure)
‘the men who engineered the tunnel’

1.1 Modify (an organism) by manipulating its genetic material.
‘it is now possible to engineer tobacco plants that are resistant to the virus’