a-battery - adobe soil
- abrasive paper
- abrasive resistance
- abrasive stick
- abrasive wear
- abrasive wheel
- abreast
- abriachanite
- abrupt
- abrupt curve
- abrupt junction
- abrupt slope
- abrupt taper
- abrupt transition
- abrupter
- abruptest
- absarokite
- abscess
- absence of feedback
- absolute address
- absolute addressing
- absolute alcohol
- absolute block
- absolute constant
- absolute coordinates
- absolute counter
- absolute deviation
- absolute electromagnetic system
- absolute electromagnetic unit
- absolute electrometer
- absolute electrostatic system
- absolute electrostatic unit
- absolute elevation
- absolute error
- absolute ether
- absolute height
- absolute humidity
- absolute level
- absolute magnetometer
- absolute measurement
- absolute motion
