working model

noun
UK /ˈwɜːkɪŋ ˈmɒdl/
US /ˈwɜːrkɪŋ ˈmɑːdl/

A working model is a small copy of something that can move or do things like the real one.

The class built a working model of a volcano that really erupted.


OTHER MEANINGS

2. A person or thing used as a good example to follow.

She is a working model of kindness for the whole team.

3. A theory or idea that helps explain how something works.

Scientists use a working model of the atom to teach students.

4. A version of a product that is complete enough to be tested.

The engineers showed a working model of the new robot arm.