A postponement is when something is moved to a later time. When a teacher postpones a test because half the class is sick, she's not canceling it; she's rescheduling it for another day. When a baseball game gets postponed due to rain, it will be played later in the season.

Postponements happen for many reasons: bad weather, unexpected problems, or needing more time to prepare. Sometimes a postponement is frustrating, like when you're excited about something and have to wait longer. Other times it's a relief, giving you more time to get ready for a big presentation or finish a project.