1. By committing to memory
   "she knew the poem by heart"
   - by memory

Encyclopedia: By heart

• atomic number 95
• atomic number 96
• atomic number 97
• atomic number 98
• atomic number 99
• atomic physics
• atomic pile
• atomic power
• atomic reactor
• atomic spectrum
• atomic theory
• atomic warhead
• atomic weapon
• atomic weight
• atomically
• atomicity
• atomisation
• atomise
• atomiser
• atomism
• atomist
• atomist theory
• atomistic
• atomistic theory
• atomistical