Of critical importance to the success of a particular endeavor.
Having death as a possible or even likely outcome; perilous.
Of critical importance to the survival of a living organism.
Of greatest importance; primary.
Being the first in time or in history.
Being one of the pieces of meat initially separated from the carcass during butchering, prior to division into smaller cuts.
A primal cut (of meat).
To take part in primal therapy.