"WHAT IS THE BIBLICAL DEFINITION OF WORSHIP?"
a) First, Second, and Third Commandments, as explained in the Small and Large Catechisms.
a) serve good order, decorum, preserve Christian discipline, and the edification of the church (FC SD, X, 1, 7, 9; Tappert, 610-612).
Tenth, for further study, you can look at the Index in Tappert, under the topics of Worship, Ceremonies, Human Traditions, and Holy Days. Also the recently published book by Dr. James Brauer of Concordia Seminary, Saint Louis "Worship, Gottesdienst, Cultus Dei." It is an excellent resource for seeing all the passages in the Lutheran Confessions which pertain to worship, and therefore the full treatment of the Bible's understanding of worship from a Lutheran perspective.