FromLatinquīdam.

quidam (pluralquidams)

1. Anobody; a person of no importance.[from 16th c.]
   • 1603, Michel de Montaigne, translated byJohn Florio,Essays, III.12:

     Aquidam gallant determined upon a time to surprise both my house and my selfe.

   • 1792,Thomas Holcroft,Anna St. Ives, vol. IV, letter 77:

     She singing a miserable ditty, a bead-roll of lamentable rhymes, strung together by thisQuidam!—This Henley!

FromLatinquīdam.

• IPA^(key): /ki.dam/

• Audio:

  (file)

quidam m (pluralquidams)

1. used to designate persons whose name are unknown or not mentioned
2. a person whoseidentity is not indicated, in aconversation, awriting
   • 2015 January,Virginie Despentes,Vernon Subutex, volume 1,Éditions Grasset,→ISBN:

     Noël regarde autour de lui, cherche les yeux de ses potes, il est hilare. Ils savent que ça ne présage rien de bon pour lequidam.

     (pleaseadd an English translation of this quotation)

3. individual

• “quidam”, inTrésor de la langue française informatisé[Digitized Treasury of the French Language],2012.

Fromquis +‎-dam(indefinite adverbial suffix). Comparequondam(“at one time”).

• (Classical Latin)IPA^(key): [ˈkʷiː.dãː]
• (modern Italianate Ecclesiastical)IPA^(key): [ˈkʷiː.dam]

quīdam (femininequaedam,neuterquiddam);indefinite pronoun

1. someone, acertain one/thing;something
   • c. 4BCE – 65CE,Seneca the Younger,Epistulae Morales ad Lucilium 3.28.10:

     Quidam vitiis gloriantur.

     Some boast of their faults.

Not to be confused withquidem.

Indefinite pronoun.

¹An alternative masculine nominative/accusative plural formquēsdam occurs in Accius.
²The genitive singular was spelledquoiusdam before the Augustan period.
³The dative singular was spelledquoidam before the Augustan period.
⁴The dative/ablative plural has a rare alternative formquīsdam/queisdam.

quīdam (femininequaedam,neuterquoddam);indefinite pronoun

1. acertain (person or thing),some (person or thing),one (in the sense of "a specific" person or thing not previously introduced in the present discourse)
   • 160BCE,Publius Terentius Afer,Adelphoe647:

     Habitant hīcquaedam mulierēs pauperculae.

     Some poor women live here.

   • c.62BCE, Cicero, chapter 1, inPro Archia Poeta‎^[1],§2:

     etenim omnes artes, quae ad humanitatem pertinent, habentquoddam commune vinculum et quasi cognationequadam inter se continentur.

     Indeed all the arts, which pertain to humanity, havesome common link and bya certain almost-kindred are held together.

   • c. 4BCE – 65CE,Seneca the Younger,Epistulae Morales ad Lucilium 1.1.1:

     Persuādē tibi hoc sīc esse ut scrībō:quaedam tempora ēripiuntur nōbīs,quaedam subdūcuntur,quaedam effluunt.

     Convince yourself that what I write is true:Certain moments are taken from us,some are stolen,still others vanish away.

Indefinite pronoun.

¹An alternative masculine nominative/accusative plural formquēsdam occurs in Accius.
²The genitive singular was spelledquoiusdam before the Augustan period.
³The dative singular was spelledquoidam before the Augustan period.
⁴The dative/ablative plural has a rare alternative formquīsdam/queisdam.

• “quidam”, inCharlton T. Lewis and Charles Short (1879),A Latin Dictionary, Oxford: Clarendon Press
• “quidam”, inCharlton T. Lewis (1891),An Elementary Latin Dictionary, New York: Harper & Brothers
• "quidam", in Charles du Fresne du Cange’sGlossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
• “quidam”, inGaffiot, Félix (1934),Dictionnaire illustré latin-français, Hachette.
• Carl Meißner; Henry William Auden (1894),Latin Phrase-Book‎^[2], London:Macmillan and Co.
  • I have a few words to say on this:mihi quaedam dicenda sunt de hac re
    

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