【法】 有权威, 命令式的, 用职权

[ adv ]
with the full authority of the office
<adv.all>
the pope must speak ex cathedra for an encyclical to be infallible

Cathedra \Cath"e*dra\, n. [L., fr. Gr. ? seat. See {Chair}.]
The official chair or throne of a bishop, or of any person in
high authority.

{Ex cathedra} [L., from the chair], in the exercise of one's
office; with authority.

The Vatican Council declares that the Pope, is
infallible ``when he speaks ex cathedra.'' --Addis &
Arnold's Cath.
Dict.