"one-time, former," 1580s, from earlier use as an adverb ("formerly") and a noun ("former holder" of some office or position), both 1530s, from Latin quondam (adv.) "formerly, at some time, at one time; once in a while," from quom, cum "when, as" (from PIE root *kwo-, stem of relative and interrogative pronouns) + demonstrative ending -dam.
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