- Anaphalis margaritacea
- Acroclinium roseum
- affectionateness
- animal oil
- aneides lugubris
- agree
- agree to differ
- acidify
- acetify
- alkalify
- accomplishment of victory
- accord
- accord and satisfaction
- air passage
- Arcellidae
- accommodation reflex
- Aralia hispida
- Aralia nudicaulis
- American spikenard
- Aralia racemosa
- Aeonium haworthii
- Argyranthemum frutescens
- Amsonia tabernaemontana
- adult intelligence
- adult male body
- articled
- ammoniate
- Agenise
- Agenize
- ambler
- adoptee
- arrogator
- aper
- apprehender
- allayer
- affiant
- assessee
- attempter
- advisee
- appreciator
- autodidact
- anaesthetist
- anesthesiologist
- anesthetist
- anointing
- anointment
- attention
- attention key
- attention deficit disorder
- aid station