- a
- A1
- A1c
- A2
- A2 level
- A3
- A4
- A5
- aa
- AAA
- AAAA
- A.A.A.L.
- A.A.A.S.
- AAC
- Aachen
- A.A.E.E.
- AAES
- AAF
- A.Agr.
- aah
- AAL
- Aalborg
- Aalesund
- aalii
- Aalst
- Aalto
- AAM
- A&E
- a&h
- a&i
- A and M
- A & P
- a&r
- a&s
- AAP
- AAPI
- A.A.P.S.S.
- aar
- Aarau
- aardvark
- aardwolf
- Aargau
- Aarhus
- AARNet
- Aaron
- Aaron, Henry
- Aaronic
- Aaronical
- Aaronite
- Aaron's beard
- Aaron's rod
- AARP
- aarti
- A.A.S.
- A'asia
- A.A.U.
- A.A.U.P.
- A.A.U.W.
- AAVE
- A-axis
- Ab
- aba
- abac
- abaca
- abaciscus
- abacist
- aback
- Abaco
- abacterial
- abactinal
- abaculus
- abacus
- Abadan
- Abaddon
- A bad penny always turns up
- bad sort, a
- ab aeterno
- abaft
- Abagtha
- Abailard
- Abakan
- abalone
- abamp
- abampere
- abandon
- abandoned
- abandonee
- Abandon hope, all ye who enter here
- abandonment
- abandonware
- abapical
- abaptiston
- Abariringa Island
- à bas
- abase
- abased
- abasement
- abash
- abashed
- abasia
- abate
- abated
- abatement
- abatis
- abat-jour
- abator
- abattage
- A battery
- abattoir
- abaxial
- abaya
- abb
- Abba
- abbacy
- abba-dabba
- Abbado
- Abbai
- Abbas
- Abbas I
- Abbasid
- abbatial
- abbé
- Abbe condenser
- abbed
- Abbe number
- abbess
- Abbeville
- Abbevillian
- abbey
- Abbey Theatre
- Abbie
- abbot
- Abbotsford
- Abbott
- Abboud
- abbr.
- abbrev.
- abbreviate
- abbreviated
- abbreviation
- abbreviatory
- Abby
- ABC
- abcoulomb
- ABC Powers
- ABC's
- ABC soil
- abd
- Abd Allah
- Abd al-Malik ibn Marwan
- Abdelkader
- Abd-el-Kadir
- Abd-el Krim
- Abderhalden
- Abd-er-Rahman Khan
- Abdias
- abdicant
- abdicate
- abdication
- abdom.
- abdomen
- abdominal
- abdominal cavity
- abdominal crunch
- abdominal thrust
- abdominoplasty
- abdominous
- Abdon
- abduce
- abducens
- abducens nerve
- abducent
- abducent nerve
- abduct
- abductee
- abduction
- abductor
- Abdul-Aziz
- Abdul-Hamid II
- Abdul-Jabbar
- Abdullah
- Abdullah ibn-Husein
- Abdullah II
- Abdul-Mejid I
- Abdul Rahman
- Abe
- abeam
- abecedarian
- abecedarium
- abecedary
- abed
- Abednego
- abegging
- Abel
- Abélard
- abele
- abelia
- Abelian
- Abelian group
- Abe Lincoln in Illinois
- Abel-meholah
- abelmosk
- Abelson
- Abenaki
- abend
- Abeokuta
- Abercrombie
- Aberdare
- Aberdeen
- Aberdeen Angus
- Aberdeen Proving Ground
- Aberdeenshire
- Aberdeen terrier
- aberdevine
- Aberdonian
- Aberfan
- Abernathy
- abernethy
- aberrant
- aberration
- Aberystwyth
- ab esse
- abessive
- abet
- abetalipoproteinemia
- abettor
- ab extra
- abeyance
- abeyant
- abfarad
- A.B.F.M.
- ABH
- abhenry
- Abhidhamma Pitaka
- abhominable
- abhor
- abhorred
- abhorrence
- abhorrent
- Abia
- Abiathar
- Abib
- abidance
- abide
- abide by
- abiding
- Abidjan
- Abie
- abient
- à bientôt
- abietate
- abietic acid
- abigail
- Abihu
- Abilene
- ability
- Abimelech
- Abingdon
- Abington
- ab initio
- Abinoam
- ab intra
- abiogenesis
- abiogenic
- abiological
- abiosis
- abiotic
- abiotic factor
- abiotrophy
- A bird in the hand is worth two in the bush
- abirritant
- abirritate
- Abishag
- a bit
- Abitibi
- abjad
- abject
- abjection
- abjective
- abjunction
- abjuration
- abjure
- Abkhaz
- Abkhazia
- Abkhazian
- abl.
- ablactate
- ablactation
- à blanc
- ablare
- ablate
- ablation
- ablative
- ablative absolute
- ablator
- ablaut
- ablaze
- able
- able-bodied
- able-bodied seaman