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Possibly from a phrase such as *reque proque (back and forth, to and fro), from re- (back), prō (forwards) and -que (and).



reciprocus (feminine reciproca, neuter reciprocum); first/second declension

  1. back and forth
  2. alternating
  3. reciprocal


First/second declension.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
nominative reciprocus reciproca reciprocum reciprocī reciprocae reciproca
genitive reciprocī reciprocae reciprocī reciprocōrum reciprocārum reciprocōrum
dative reciprocō reciprocō reciprocīs
accusative reciprocum reciprocam reciprocum reciprocōs reciprocās reciproca
ablative reciprocō reciprocā reciprocō reciprocīs
vocative reciproce reciproca reciprocum reciprocī reciprocae reciproca


  • reciprocus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • reciprocus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • reciprocus in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français [Illustrated Latin-French Dictionary], Hachette
  • De Vaan, Michiel (2008) Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, page 516