Allied by blood; connected or related by birth; specifically, of the same parentage, near or remote, as another. See cognation, 1.Related in origin; traceable to the same source; proceeding from the same stock or root; of the same family, in a general sense: as, cognate languages or dialects; words cognate in origin.Allied in nature, quality, or form; having affinity of any kind: as, cognate sounds.Any similar notions.n. One connected with another by ties of kindred; specifically, in the plural, all those whose descent can be traced from one pair. In its technical use in Roman law it implied a lawful marriage as the source. See agnate and cognation, 1.n. Anything related to another by origin or derivation, as a language or a word: as, the Latin and Greek languages are cognates.