1. in a way that uses or relates to science or scientific methods
2. in a careful, systematic way based on observation and testing

Examples

• The theory has been scientifically proven through repeated experiments.
• We need to approach this problem scientifically rather than guessing.
• The data was collected and analyzed scientifically.
• Scientifically speaking, there is no evidence to support that claim.
• The medicine was scientifically tested before being approved.
• She explained the phenomenon scientifically using established principles.