- impaction
- impact ionization
- impact ionization, collision ionization
- impact ionization, ionization by collision
- impaction of omasum
- impaction of rumen
- impactite
- impact lightflash
- impact load
- impact mark
- impact melt breccia lunar meteorites
- impact melt breccias
- impact metallogeny
- impact mill
- impact molding
- impact molding; shock molding
- impactogen
- impactometer
- impactor
- impact parameter
- impact parameter; collision parameter
- impact point
- impact printer
- impact roller
- impact rope