Spŏn'sor, n.
n. [Lat., from spondere, sponsum, to engage one's self. See supra.]
Sense 1. One who binds himself to answer for another, and is responsible for his default; a surety.
Sense 2. One who, at the baptism of an infant, professes the Christian faith in its name, and guarantees its religious education; a godfather or godmother.