Meaning of “engineer” - Learner’s Dictionary

engineer

noun [ C ] uk us /ˌendʒɪˈnɪər/
MACHINES/BRIDGES ETC

A2 someone whose job is to design, build, or repair machines, engines, roads, bridges, etc:

a software engineer
TRAIN US

someone whose job is to drive a train

(Definition of “engineer noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)