prelude
noun
a preliminary to an action, event, condition, or work of broader scope and higher importance.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
He was sitting on the edge of the bed idly smoothing the wrinkles out of a pet necktie when a gently insinuating knock unpreluded by a step in the hall caused him to start.
From Blacksheep! Blacksheep! by Meredith Nicholson