introductory act
introductory provision

In the introductory acts of the book, for instance, she resurrects a girl who committed suicide, who, unbeknownst to her mother, was being molested by her father.

The Romanovs and the Bolshevik troops of the hospital scene were expanded upon in two introductory acts, whose classical style clashed with the expressionism of the original ballet.

Part 1 contains introductory provisions.

In its introductory provisions, the document not only places a high value on democracy but also asserts the right of defense against attempts by force to encroach upon or overthrow "state independence, territorial integrity, or the constitutional system" (Article 3).