praerogativa

Etymology
Substantive of.

Noun

 * 1) The tribe or century to which it fell by lot to vote first in the Comitia.
 * 2) The choice of the century that voted first.
 * 3) A previous choice, verdict or election.
 * 4) A sure sign, token, prognostic or omen.
 * 5) A prior preference, privilege, prerogative or claim.