B2a part of an activity or a period of development: The project is in its final stages and should be completed by August.They did the last stage of their journey on foot.Our marriage is going through a difficult stage at the moment.Their youngest child is at the stage where she can say individual words but not full sentences.I'm not tired at the moment but I will need a rest at some stage (= at some time) during the walk.Andrew spends all his spare time playing with his computer but it's probably just a stage he's going through(= a period of development that will end soon).Stages and phasesin stages›If you do something in stages, you divide the activity into parts and complete each part separately: We're decorating the house in stages so it won't be ready for another couple of months.Stages and phases›specializedone of the separate parts of a rocket, each part having its own engine: Once its fuel supply runs out, each stage separates from the main part of the rocket and falls back to Earth.Space travel