cardinal

US /ˈkɑːr.dɪ.nəl/
UK /ˈkɑːr.dɪ.nəl/
"cardinal" picture
1.

a North American songbird of the family Cardinalidae, the male of which is typically bright red.

:
A bright red cardinal landed on the bird feeder.
The sound of the cardinal's song filled the morning air.
2.

a leading dignitary of the Roman Catholic Church, nominated by the Pope and forming the Sacred College which elects succeeding Popes.

:
The new cardinal was appointed by the Pope.
He hopes to become a cardinal one day.
1.

of prime importance; fundamental.

:
Respect for human rights is a cardinal principle.
He made a cardinal error in his calculations.