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soonest (EN)
adjective, adverb

This word can also be a form of:
soon (adverb)

adjective “soonest”

base form soonest, non-gradable
  1. earliest; first in time
    The soonest appointment we have is next Friday.

adverb “soonest”

soonest
  1. (informal) very soon; as soon as possible; urgently
    They need the report soonest, so we must finish it today.