LATIN DICTIONARYLexicon Latīnum
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“allied” in Latin

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

allied
p. p., foederatus: foedere junctus: socius (as ally).
Related by blood or marriage, propinquus, cum aliquo propinquitate conjunctus (general term): necessarius (joined by ties of family or office, sometimes = PROP., of a distant degree of relationship): agnatua (by the father’s side): cognatus, cognatione conjunctus (by the mother’s side): affinis, affinitate or affinitatis vinculis conjunctus (connected by marriage): consanguineus, consanguinitate propinquua (by blood; especially of full brothers and sisters). Closely allied, arcta propinquitate or propinqua cognatione conjunctus: cum aliquo conjunctus.
Figuratively, closely connected, propinquus, vicinus, finitimus (alicui or alicui rei). (The words are found in this connection and order), propinquus et finitimus: finitimus et vicinus. ☞ Affinis, in this sense, is without any sufficiently old authority.

Quick answer

What is the Latin word for allied?
The usual Latin words for “allied” are foederō, socius, propinquus; also necessārius, cognātus, affīnis. 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.