Enter on Definition 1 of 3Pro Tip 1/3Initiating Action Used to express the action of taking the first steps in starting something. As soon as we have the green light, we'll enter on the planning stage. Pro Tip 2/3Active Engagement Implies direct involvement and personal responsibility in the task or duty. The committee will enter on their roles at the start of next month. Pro Tip 3/3Preceding Start May be used just before commencing a significant or formal task. The prime minister will enter on peace talks with the delegates.