pivotal

US /ˈpɪv.ə.t̬əl/
UK /ˈpɪv.ə.t̬əl/
"pivotal" picture
1.

crucial, fundamental, essencial

of crucial importance in relation to the development or success of something else

:
The discovery of penicillin was a pivotal moment in medicine.
A descoberta da penicilina foi um momento crucial na medicina.
Her role in the project was absolutely pivotal.
O papel dela no projeto foi absolutamente fundamental.