From G21; exultation; specially, welcome:—gladness, (exceeding) joy.
Outline
exultation, extreme joy, gladness
At feasts, people were anointed with the "oil of gladness". Hbr 1:9 alludes to this inaugural ceremony of anointing, and uses it as an emblem of the divine power and majesty to which the Son of God has been exalted.