pivotal

Of, relating to, or serving as a pivot.

Being of vital or central importance; crucial.

Of the nature of or forming a pivot; belonging to or constituting a pivot, or that upon which something turns or depends: as, a pivotal question; a pivotal State in an election.

Of or pertaining to a pivot or turning point; belonging to, or constituting, a pivot; of the nature of a pivot

of, relating to, or being a pivot

being of crucial importance; central, key

being of crucial importance