'alleluiatic' originates from the Late Latin word 'alleluia,' which is derived from the Hebrew word 'hallelujah,' meaning 'praise the Lord.'

'alleluia' transformed into the English word 'alleluia,' and eventually became the adjective 'alleluiatic' to describe things related to expressions of praise.

Initially, it meant 'praise the Lord,' but over time it evolved into its current meaning of 'relating to expressions of praise.'