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Latin word quando comes from Latin ex, e (A name of the letter X. (+ ablative) out of, from.), Latin quam
ex, e (Latin)
A name of the letter X. (+ ablative) out of, from.
quam (Latin)
(after comparative nouns) than. (in comparisons) as. In what (which) way, to what (which) degree; how, how much, as much as, as far as.
quando (Latin)
(interrogative) "When?". (relative) "When". Because. When.