(1):
(a.) Of the same or a similar nature; of the same family; proceeding from the same stock or root; allied; kindred; as, a cognate language.
(2):
(n.) One who is related to another on the female side.
(3):
(n.) One of a number of things allied in origin or nature; as, certain letters are cognates.
(4):
(a.) Allied by blood; kindred by birth; specifically (Law), related on the mother's side.