1) Worship given to saints 
inferior veneration of saints and angels in comparison with God
• (n.) An inferior kind of veneration or worship, given to the angels and saints as the servants of God.
Du·li'a noun [ Late Latin , from Greek ... servitude, from ... slave.] (R. C. Ch.) An inferior kind of veneration or worship, given to the angels and saints as the servants of God. 
dulia, douleia; dulian, dulosis Servitude, service; specifically, the inferior kind of veneration paid by Roman Catholics to saints and angels.
veneration and invocation given to saints as the servants of God. Cf. hyperdulia, latria.