engine

noun
  1. A machine designed to convert energy into useful mechanical motion. It is commonly used to power vehicles, machinery, and other devices. noun
    The car's engine roared to life as she turned the key.
    Engine efficiency is crucial for reducing fuel consumption.
  2. A locomotive or the part of a train that provides the motive power. noun
    The steam engine pulled the train across the countryside.
    The engineer checked the engine before the train departed.
  3. A piece of software or a system that performs a specific function, often related to computing or data processing. noun
    The search engine quickly provided results for her query.
    The game engine rendered the graphics in real-time.
  4. An agent or instrument that is used to achieve a particular purpose or result. noun
    Education is often seen as an engine of social change.
    Innovation acts as an engine for economic growth.