moreimportantpart

noun
UK /mɔːr ɪmˈpɔːtənt pɑːt/
US /mɔːr ɪmˈpɔːrtnt pɑːrt/

The piece that matters the most.

The engine is the moreimportantpart of the car.


OTHER MEANINGS

2. The section you should pay the most attention to.

Read the moreimportantpart of the letter first.

3. The best or most useful piece of something.

The moreimportantpart of the gift was the kind note.

4. The part that makes the biggest difference.

Practice is the moreimportantpart of learning to swim.