Pronto

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early 20th century: from Spanish, from Latin promptus (see prompt).

wiktionary

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From Spanish pronto, from Latin prōmptus. Doublet of prompt.

etymonline

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pronto (adv.)

"promptly, soon, quickly," 1850, from Spanish pronto "ready, prompt," from Latin promptus (see prompt (v.)). The Italian cognate of the Spanish word, pronto, had been used in English by 1740 in musical instructions.