HALLELUJA, a word signifying "Praise the Lord." The singing halleluja (first introduced into the church-service by St. Jerome), was a sort of invitatory, or call to each other, to praise the Lord. St. Austin says, that in some churches it was sung only on Easter-day, and the 50 days of Pentecost; but that even in those churches where it was most in use, it was never used in the time of Lent.