Tenney writes, “The “one and only Son” represents the Greek monogenēs, which is derived from genos, which means “kind” or “species.” It means “literally ‘one of a kind,’ ‘only,’ ‘unique’ (unicus), not ‘only-begotten.’” Tenney, M. C. (1981). John. In F. E. Gaebelein (Ed.), The Expositor’s Bible Commentary, Volume 9: John and Acts (F. E. Gaebelein, Ed.) (33). Grand Rapids, MI: Zondervan Publishing House.