say it: UR-lee-uhst
earliest is an adjective and adverb meaning "(comparative and superlative of `early') more early than; most early". It carries 2 recorded senses.
with the least delay
“the soonest I can arrive is 3 P.M.”
Definitions, synonyms and semantic relations for earliest come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.