Begin/bɪˈɡɪn/ Definition 1 of 4Pro Tip 1/3Performance Start Use 'begin' for starting events or actions, especially formal or planned ones. The concert will begin at 8 PM. Pro Tip 2/3Initial Step 'Begin' can emphasize the first step in a series or process. Begin by mixing the dry ingredients. Pro Tip 3/3Group Activities Useful for activities involving more than one person, hinting collaboration. We'll begin group discussions now.