- an editor's work or office
- american falls
- ammoniacal fermentation
- ammoniacum gum resin
- alienor
- anti_
- adverbial particle
- alan paton
- alan stewart paton
- acinus
- all_sided
- air force space command
- a week wednesday
- after load
- ahpcrc
- anti_climax
- ampullar
- aerosolised
- access authority
- access line
- access method routine
- aerosol therapy
- anteroposterior axis
- anteroposterior diameter
- anteromedial basal bronchus
- airborne transmission
- acute alcoholic hepatitis
- antiglobulin cross_match
- aciduria
- asian russia
- agrobiological
- antiatherosclerotic
- abnormal pregnancy
- abnormal puerperium
- alicia alonso
- as many (as)
- antenuptial
- archosauria
- appalachian mountains
- archaeozoic aeon
- archeozoic eon
- archean aeon
- alveolon
- alternate routing
- as you wish
- an aviator
- anglican catholic
- as a matter of princ:ple
- anti_anxiety agent
- at any price