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rápido
fast
rapid
happening in a short time or at a great rate
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-ido
adjective suffix
Rápido means fast and can be thought of as related to the English word rapid0, with the -ido1 (adjective suffix1) ending.
adjective
  1. fast
    Moving or acting with great speed
    El tren es muy rápido y llegará pronto. // The train is very fast and will arrive soon.
adverb
  1. quickly
    With great speed; quickly
    Corre rápido si quieres alcanzar el autobús. // Run quickly if you want to catch the bus.