central and important (Cambridge)
of great importance because other things depend on it (Oxford)
بیوقوف ,احمق
She played a pivotal role in the civil rights movement. (Cambridge).
Accountancy, law and economics are pivotal to a successful career in any financial services area.(Oxford)
played a pivotal role
pivotal to a successful career
Vital
Center
Crucial
Inessential
Unimportant
Pivot