Vine's Expository Dictionary: View Entry
TDNT Reference: 1:19,4
ἀγαλλίασις agallíasis, ag-al-lee'-as-is; from G21; exultation; specially, welcome:—gladness, (exceeding) joy.
The KJV translates Strong's G20 in the following manner: gladness (3x), joy (1x), exceeding joy (1x).
Strong's Number G20 matches the Greek ἀγαλλίασις (agalliasis),
which occurs 5 times in 5 verses
in the TR Greek.