 Summer of '69  is a song recorded by Canadian recording artist Bryan Adams, from his fourth studio album, Reckless (1984). The song was written by Adams and Jim Vallance, a long-time writing partner of Adams.
â¢ UNDULATION (noun). The noun UNDULATION has 3 senses: 1. an undulating curve. 2. wavelike motion; a gentle rising and falling in the manner of waves. 3. (physics) a movement up and down or back and forth. Familiarity information: UNDULATION used as a noun is uncommon.
verb. verb. 1  To move freely back and forth or up and down in the air, as branches in the wind. 2  To make a signal with an up-and-down or back-and-forth movement of the hand or an object held in the hand: waved as she drove by. 3  To have an undulating or wavy form; curve or curl: Her hair waves naturally.