Emergent /(?)/

E·mer·gent

Emergent

a.
  1. Rising or emerging out of a fluid or anything that covers or conceals; issuing; coming to light.
    The mountains huge appear emergent.
  2. Suddenly appearing; arising unexpectedly; calling for prompt action; urgent.
    Protection granted in emergent danger.

Phrases & Compounds
Emergent year
the epoch or date from which any people begin to compute their time or dates; as, the emergent year of Christendom is that of the birth of Christ; the emergent year of the United States is that of the declaration of their independence.