Wiktionary
n. A person whose closest common ancestor with another person is a great-great-grandparent.
Usage examples of "third cousin".
When he had been at work for some time in the head office in Honolulu he married his third cousin, Malama Janders, who was Hewie Janders' sister, and within a year he had a son Bromley, whom he prudently registered for both Punahou and Yale.
Henry Lamberhurst, which instantly reminded her that a third cousin of her own had married a Lamberhurst, who, in his turn, was linked by two other marriages with a branch of the Austell family.
Since the most vigorous factions were deadlocked, and many held back from supporting either man, Decanto and Axantucar were forced to cede the privilege to a third cousin, Pimaca, to act as Omechan Warchief for the imperial honour guard.
The head of my family barely knows I exist, for I am a third cousin, once removed.
It was my third cousin, Fu San Sung the family had to pay $600,000 to get him back safely&hellip.
He must know that many folk would not gladly accept the illegitimate son over the legitimate third cousin.