Monogenes

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Monogenēs (Unigenitus) is a Greek term (μονογενής) in Christology, usually translated as "Only begotten". This is based on deriving monogenēs from monos μονος (only) and gennaō γενναω (beget). An alternative understanding derives monogenēs from genos γενος (kind or type, cf. Latin genus), so means ‘unique’, ‘one of a kind’. This is supported by New Testament usage: Hebrews 11:17 refers to Isaac as Abraham’s ‘only begotten son’, yet Abraham begat other sons (Ishmael, and by Keturah). But Isaac was Abraham’s unique son, the son especially promised to him and Sarah in their old age, and who would carry on the covenant line.