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Latin cum
Asturian cun (link)
Asturian co (link)
Corsican cun (link)
Friulian cu (link)
Proto-Germanic *ga- (cognate)
Proto-Germanic *hansō (cognate)
Proto-Indo-European *ḱóm (inherited)
Proto-Indo-European *kʷóm (derived)
Proto-Indo-European *kʷos (mention)
Proto-Indo-European *kʷis (mention)
Istriot cu' (link)
Proto-Italic *kom (inherited)
Latin com (mention)
Latin quom (mention)
Latin quam (mention)
Latin tum (mention)
Latin tam (mention)
Latin quum (link)
Latin quom (link)
Latin tum (link)
Latin movet (link)
Latin res (link)
Latin multitudinem (link)
Latin duces (link)
Latin tum (link)
Latin quomque (link)
Latin cumque (link)
Latin quondam (link)
Latin quoniam (link)
Latin umquam (link)
Ladin co (link)
Ladin cun (link)
Sardinian cun (link)
Proto-Slavic *sъ(n) (cognate)

English cum (derived)
English coven (mention)
English gain (cognate)
English community (mention)
English com- (mention)
English conclave (mention)
English conspire (mention)
English con- (mention)
English cum laude (mention)
English custom (mention)
English costume (mention)
English coercion (mention)
English compatriot (mention)
English consuetude (mention)
English (mention)
English confelicity (derived)
English kastom (mention)
English futurama (link)
English accusativus cum infinitivo (mention)
Aragonese con (inherited)
Asturian con (inherited)
Catalan combatre (inherited)
Catalan combatre (inherited(ca/oc))
Chavacano conmigo (derived)
Corsican (inherited)
German c. (link)
Dalmatian con (inherited)
Dalmatian conmaic (inherited)
Greek κουμπάρος (mention)
Esperanto kun (borrowed)
Esperanto konspiri (mention)
Spanish con (inherited)
Spanish conmigo (inherited)
Spanish contigo (derived)
Spanish con- (mention)
Spanish compadre (mention)
Spanish combatir (inherited)
Spanish compaña (mention)
Fala con (inherited)
French con- (mention)
French costume (mention)
French avec (cognate)
French combattre (inherited)
French contourner (mention)
French coutume (mention)
Middle French coustume (mention)
Old French costume (mention)
Old French consuetude (mention)
Old French cumbatre (mention)
Old French coustume (mention)
Old French combatre (inherited)
Old French custume (mention)
Friulian cun (inherited)
Galician con (inherited)
Galician contigo (derived)
Galician consigo (inherited)
Galician costume (mention)
Galician convosco (derived)
Galician comigo (inherited)