(Int - air
- (International) Certificate of Fitness for the Carriage of Dangerous Chemicals in Bulk
- A face
- a slice of furrow
- a year's cast of lamb
- A-frame support
- A-tongs
- A1 horizon
- A2 horizon
- abalone
- abandoned road
- abandoned tree
- abandonment
- abate
- abatement
- abatis
- abaxial stoma
- abhesive paper
- ability to take glue
- ablactate
- ablactation
- ablation
- Abney level
- abnodate
- abnormal growth
- aboricultural industry
- above ground
- abraded fiber
- abrading tools
- abrasion
- abrasive barker
- abrasive base paper
- abrasive cloth
- abrasive cutting
- abrasive paper
- abrasive planer
- abrasive sanding
- abrasive siding
- abrasive siding machine
- abrasive slurry
- abrasiveness
