Important

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late Middle English: from medieval Latin important- ‘being of consequence’, from the verb importare (see import).

wiktionary

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From Middle English important, from Medieval Latin important-, importāns.

etymonline

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important (adj.)

mid-15c., "significant, of much import, bearing weight or consequence," from Medieval Latin importantem (nominative importans) "important, momentous," present-participle adjective from importare "be significant in," from Latin importare "bring in, convey, bring in from abroad," from assimilated form of in- "into, in" (from PIE root *en "in") + portare "to carry," from PIE root *per- (2) "to lead, pass over." The meaning "pretentious, pompous" is from 1713. Related: Importantly. Compare import (v.) and (n.).