- AB
- ab initio
- aba
- ABA transit number
- abaca
- abacinate
- aback
- abactinal
- abacus
- Abadan
- abaft
- abalone
- abamp
- abampere
- abandon
- abandoned
- abandoned infant
- abandoned person
- abandoned ship
- abandonment
- abarticulation
- abase
- abasement
- abash
- abashed
- abashment
- abasia
- abasia trepidans
- abasic
- abatable
- abatable nuisance
- abate
- abatement
- abatement of a nuisance
- abatic
- abatis
- abator
- abattis
- abattoir
- abaxial
- abaxially
- abaya
- ABB
- abbacy
- abbatial
- abbe
- Abbe condenser
- abbess
- abbey
- abbot
- Abbott Lawrence Lowell
- abbreviate
- abbreviated
- abbreviation
- abbreviator
- ABC
- abcoulomb
- ABCs
- Abdias
- abdicable
- abdicate
- abdication
- abdicator
- abdomen
- abdominal
- abdominal actinomycosis
- abdominal aorta
- abdominal aortic aneurysm
- abdominal breathing
- abdominal cavity
- abdominal delivery
- abdominal external oblique muscle
- abdominal muscle
- abdominal nerve plexus
- abdominal pregnancy
- abdominal wall
- abdominocentesis
- abdominoplasty
- abdominous
- abdominousness
- abdominovesical
- abduce
- abducens
- abducens muscle
- abducens nerve
- abducent
- abducent nerve
- abduct
- abducting
- abduction
- abductor
- abductor muscle
- abeam
- abecedarian
- abecedarius
- abed
- Abel
- Abel Janszoon Tasman
- Abel Tasman
- Abelard
- abele
- abelia
- Abelian group
- Abelmoschus
- Abelmoschus esculentus
- Abelmoschus moschatus
- abelmosk
- Abenaki
- Aberdare
- Aberdeen
- Aberdeen Angus
- Aberdonian
- aberrance
- aberrancy
- aberrant
- aberrate
- aberration
- abet
- abetalipoproteinemia
- abetment
- abettal
- abetter
- abettor
- abeyance
- abeyant
- abfarad
- abhenry
- abhor
- abhorrence
- abhorrent
- abhorrer
- abidance
- abide
- abide by
- abiding
- Abidjan
- abience
- abient
- Abies
- Abies alba
- Abies amabilis
- Abies balsamea
- Abies bracteata
- Abies concolor
- Abies fraseri
- Abies grandis
- Abies lasiocarpa
- Abies lowiana
- Abies venusta
- Abila
- Abilene
- ability
- abiogenesis
- abiogenetic
- abiogenist
- abiotrophy
- abject
- abjection
- abjectly
- abjuration
- abjure
- abjurer
- Abkhas
- Abkhasian
- Abkhaz
- Abkhazia
- Abkhazian
- ablactate
- ablactation
- ablate
- ablated
- ablation
- ablative
- ablative absolute
- ablative case
- ablaut
- ablaze
- able
- able seaman
- able-bodied
- able-bodied seaman
- able-bodiedism
- able-bodism
- ableism
- ablepharia
- ablism
- abloom
- ABLS
- ablution
- ablutionary
- ably
- ABM
- Abnaki
- abnegate
- abnegation
- abnegator
- Abney level
- abnormal
- abnormal psychology
- abnormalcy
- abnormality
- abnormally
- Abo
- ABO antibodies
- ABO blood group system
- ABO group
- ABO system
- aboard
- abocclusion
- abode
- abohm
- abolish
- abolishable
- abolishment
- abolition
- abolitionary
- abolitionism
- abolitionist
- abomasal
- abomasum
- abominable
- abominable snowman
- abominably
- abominate
- abomination
- abominator
- Abor
- aborad
- aboral
- Aboriginal
- Aboriginal Australian
- aborigine
- abort
- aborticide
- abortifacient
- abortion
- abortion pill
- abortion-inducing drug
- abortionist
- abortive
- abortively
- abortus
- aboulia
- aboulic
- abound
- abound in
- abounding
- about
- about turn
- about-face
- above
- above all
- above-mentioned
- above-named
- aboveboard
- aboveground
- abracadabra
- abrachia
- abradant
- abrade
- abrader
- abrading stone
- Abraham
- Abraham Lincoln
- Abraham Stoker
- Abrahams bosom
- Abramis
- Abramis brama
- abranchial
- abranchiate
- abranchious
- abrase
- abrasion
- abrasive
- abrasive material
- abrasiveness
- abreact
- abreaction
- abreast
- abridge
- abridged
- abridgement
- abridger
- abridgment
- abroach
- abroad
- Abrocoma
- abrocome
- abrogate
- abrogation
- abrogator
- Abronia
- Abronia elliptica
- Abronia fragrans
- Abronia latifolia
- Abronia maritima
- Abronia umbellata
- Abronia villosa
- abrupt
- abruptio placentae
- abruption
- abruptly
- abruptly-pinnate
- abruptly-pinnate leaf
- abruptness
- Abruzzi
- Abruzzi e Molise
- ABS
- abscess
- abscessed
- abscessed tooth
- abscise
- abscissa
- abscission
- abscond
- absconder
- abscondment
- abseil
- abseiler
- absence
- absence seizure
- absence without leave
- absent
- absentee
- absentee ballot
- absentee rate
- absenteeism
- absently
- absentminded
- absentmindedly
- absentmindedness
- absinth
- absinthe
- absinthe oil
- absolute
- absolute alcohol
- absolute ceiling
- absolute frequency
- absolute magnitude
- absolute majority
- absolute pitch
- absolute scale
- absolute space
- absolute temperature
- absolute threshold
- absolute value
- absolute viscosity
- absolute zero
- absolutely
- absoluteness
- absolution
- absolutism
- absolutist
- absolutistic
- absolve
- absolved
- absolver
- absolvitory
- absorb
- absorbable
- absorbance
- absorbate
- absorbed
- absorbefacient
- absorbency
- absorbent
- absorbent cotton
- absorbent material
- absorber
- absorbing
- absorptance
- absorption
- absorption band
- absorption coefficient
- absorption factor
- absorption indicator
- absorption spectrum
- absorption unit
- absorptive
- absorptivity
- absquatulate
- abstain
- abstainer
- abstemious
- abstemiously
- abstemiousness
- abstention
- abstentious
- abstinence
- abstinent
- abstract
- abstract art
- abstract artist
- abstract entity
- Abstract Expressionism
- abstract thought
- abstracted
- abstractedly
- abstractedness
- abstracter
- abstraction
- abstractionism
- abstractionist
- abstractive
- abstractly
- abstractness
- abstractor
- abstruse
- abstrusely
- abstruseness
- abstrusity
- absurd
- absurdity
- absurdly
- absurdness
- Abu Ali al-Husain ibn Abdallah ibn Sina
- Abu Dhabi
- Abu Hafs al-Masri Brigades
- Abu Nidal Organization
- Abu Sayyaf
- Abudefduf
- Abudefduf saxatilis
- Abuja
- Abukir
- Abukir Bay
- Abul-Walid Mohammed ibn-Ahmad Ibn-Mohammed ibn-Roshd
- abulia
- abulic
- abundance
- abundant
- abundantly
- abuse
- abused
- abuser
- abusive
- abusively
- abut
- Abutilon
- Abutilon theophrasti
- abutment
- abutment arch
- abutter
- abuzz
- abvolt
- abwatt
- aby
- Aby Moritz Warburg
- Aby Warburg
- Abydos
- abye
- Abyla
- abysm
- abysmal
- abysmally
- abyss
- abyssal
- abyssal zone
- Abyssinia
- Abyssinian
- Abyssinian banana
- Abyssinian cat