importantpiece
nounUK /ɪmˈpɔːtənt piːs/
US /ɪmˈpɔːrtənt piːs/
A thing that matters a lot and is needed to make something whole.
The final puzzle piece was the importantpiece that completed the picture.
OTHER MEANINGS
2. The most valuable or significant item in a group or collection.
The old letter was the importantpiece of the family's history.
3. A person who plays a very necessary role in a team or plan.
She was the importantpiece that kept the whole project moving.
4. A detail that makes a big difference to the result.
Getting the timing right was the importantpiece of the recipe.