LATIN DICTIONARYLexicon Latīnum
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“related” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

related
PROP., propinquus alicui (of near relationship in general): necessarius (connected by ties of office, etc.; sometimes used with regard to distant relationship): cognatus (relate on the father’s or mother’s side): agnacus (on the father’s side): affinis (by marriage): consanguineus, consanguinitate proprius (relate by blood, especially of brothers and sisters by the same mother): consobrinus (of the same mother’s children): sobrinus (of cousins): gentilis (of the same clan). To be related to anybody, alicui propinquum esse; alicui or cum aliquo propinquitate conjuncium esse (in general): cognatione aliquem contingere or cum aliquo conjunctum esse (on the father’s or the mother’s side): affinitate, or affinitatis vinculis, cum aliquo conjunctum esse (by marriage): consanguinitate alicui propinquum esse; sanguinis vinculo alicui, or cum aliquo, conjunctum esse (by blood). To be distantly related to anybody, aliquem longinqua cognatione contingere: to be not at all related to anybody, nullo gradu alicujus domum attingere.
Figuratively, propinquus, finitimus, vicinus, alicui or alicui rei. (The words are found in this connection and order.) propinquus et finitimus; vicinus et finitimus. All the arts are related to each other, omnes artes quasi cognatione aliqua inter se continentur. Not to be related to each other; Vid: to have no RELATIONSHIP.

Quick answer

What is the Latin word for related?
The usual Latin words for “related” are necessārius, cognātus, affīnis; also cōnsanguineus, cōnsobrīnus, sobrīnus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.