stepwise

adjective
1
in a series of steps, rather than continuously
مرحله‌به‌مرحله, گام‌به‌گام, پله به پله, قدم به قدم
2
moving in a way that uses only the notes that are next to each other in a scale
پله‌ای, مرحله‌ای, گام‌به‌گام, پلکانی