即 - instant, namely, as is

ready fire-power; battle-ready forces; immediate asset (to a team or firm); someone who can be an immediately effective player or worker

improvisation

immediate; right there on the spot; impromptu; instant; instantaneous

prompt; immediate; in real time

selling on the spot

impromptu; improvised; extempore; ad-lib; off-the-cuff

instant death

(on) the same day

immediately; right away; on the spot

immediate effect; instant effect

that is (to say); namely; i.e.

accession to the throne; enthronement