Synonyms for Earliest (same or very similar meaning)
WordNet sense 1 ((comparative and superlative of `early') more early than; most early):
earlierWordNet sense 2 (at or near the beginning of a period of time or course of events or before the usual or expected time):
earlyWordNet sense 3 (with the least delay):
soonestFrom the ODE community, based on WordNetadd/edit