As and when Definition 1 of 2Pro Tip 1/3Reactiveness Used to indicate a response to an event right after it happens, showing adaptiveness. We'll organize extra help as and when students request it. Pro Tip 2/3No Schedule Implies that there's no fixed time to act; actions depend on future circumstances. Vacation days can be taken as and when you prefer. Pro Tip 3/3Uncertainty Expresses an action or decision will be made when necessary, but the timing is unknown. Repairs will be carried out as and when we find the defects.