1. An atypical or irregular advancement or development that deviates from the normal or expected course
The patient's abnormal progression of the disease required immediate intervention.
A progressão anormal da doença do paciente exigiu intervenção imediata.
2. In medical or scientific contexts, a deviation from typical stages or patterns of growth, disease development, or recovery
Doctors noted an abnormal progression in the tumor's growth rate.
Os médicos observaram uma progressão anormal na taxa de crescimento do tumor.