Strong’s Greek
G1077 — genesia
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
γενέσια
genesia — pronounced ghen-es'-ee-ah
neuter plural of a derivative of 1078; birthday ceremonies:--birthday. see GREEK for 1078
2 occurrences in the KJV.
Matthew 14:6
But when Herod’s birthday was kept, the daughter of Herodias danced before them, and pleased Herod.
Mark 6:21
And when a convenient day was come, that Herod on his birthday made a supper to his lords, high captains, and chief estates of Galilee;