- antivaxxer
- antivenin
- antivenom
- antiviral
- antivirus
- antivitamin
- antivivisection
- antivivisectionist
- antiwar
- antiwhite
- antiwork
- antiwork movement
- antiworld
- antixerophthalmic vitamin
- anti-Zionist
- antler
- antlered
- antlerite
- antler moth
- Antlia
- antlike
- antlion
- ant lion
- Antofagasta
- Antoine
- Antoinette
- Anton
- Antonello da Messina
- Antonescu
- Antonia
- Antonine Wall
- antoninianus
- Antoninus
- Antoninus Pius
- Antonioni
- Antonius
- antonomasia
- Anton Piller order
- Antony
- Antony, Mark
- Antony and Cleopatra
- antonym
- antonymous
- antonyms
- antre
- Antrim
- Antron
- antrorse
- antrum
- Antseranana
- antshrike
- ants in one's pants, have
- Antsiranana
- antsy
- ant-thrush
- ANTU
- Antung
- antwackie
- Antwerp
- Antwerp blue
- antwren
- Anu
- ANU
- añu
- Anubis
- anucleate
- anucleolate
- a number of
- anumeric
- Anunnaki
- Anuradhapura
- anuran
- anuresis
- anuria
- anurous
- anus
- Anuszkiewicz
- Anvers
- anvil
- anxiety
- anxiety disorder
- anxiety neurosis
- anxiolytic
- anxious
- anxiously
- anxiousness
- anxious seat
- any
- Anyang
- anybody
- any day
- anyhoo
- anyhow
- any longer
- anymore
- any more
- any number of
- any old
- anyon
- anyone
- anyone's guess
- anyplace
- any port in a storm
- Any port in a storm
- anyroad
- anything
- anything but
- anything goes
- anything like
- anytime
- anyway
- anyways
- anywhere
- anywheres
- anywise
- ANZ
- Anza
- ANZAAS
- Anzac
- Anzac Day
- Anzengruber
- Anzhero-Sudzhensk
- Anzio
- ANZUS
- Anˈdorran
- Anˈgolan
- anˈnoying
- Anˈtiguan
- anˌnihiˈlation
- anˌtagoˈnistic
- ao
- AO
- AOA
- AOB
- AOC
- AOCB
- ao dai
- AOE
- Aoede
- AOH
- A-OK
- Aoki
- aole
- Aomori
- AONB
- A one
- A-one
- aor
- AOR
- Aoraki-Mount Cook
- aorist
- aoristic
- aorta
- aortic
- aortic arch
- aortic insufficiency
- aortic stenosis
- aortic valve
- aortitis
- aortoclasia
- aortography
- Aosta
- Aotearoa
- aoudad
- Aouita
- ap
- AP
- ap-
- Ap.
- apa
- Apa
- APA
- apace
- apache
- Apache
- Apachean
- apache dance
- Apache plume
- Apaches
- Apalachee Bay
- Apalachicola
- apanage
- apapane
- Apaporis
- aparavidya
- aparejo
- Aparri
- apart
- apart from
- apartheid
- aparthotel
- apartment
- apartment hotel
- apartment house
- apartmentize
- apast
- apastron
- apatetic
- apathetic
- apathetically
- apathy
- apatite
- apatosaurus
- APB
- APC
- ape
- apeak
- APEC
- ape hangers
- Apeldoorn
- apelike
- Apelles
- apeman
- ape-man
- Apennines
- A penny saved is a penny earned
- Apepi
- aperçu
- aperient
- aperiodic
- apéritif
- aperitive
- apertometer
- aperture
- aperture card
- aperture priority
- aperture-priority
- aperture synthesis
- apery
- apeshit
- apetalous
- apex
- APEX
- Apex Club
- apex predator
- Apgar
- apgar score
- Apgar score
- aph.
- aphaeresis
- aphagia
- aphakia
- aphanite
- aphanitic
- aphantasia
- aphasia
- aphasic
- aphelandra
- aphelion
- apheliotropic
- apheliotropism
- aphemia
- apheresis
- aphesis
- aphetic
- aphid
- aphid lion
- aphis
- APHIS
- aphonia
- aphonic
- aphorism
- aphorist
- aphoristic
- aphorize
- aphotic
- aphrodisia
- aphrodisiac
- Aphrodite
- Aphrodite Terra
- aphtha
- aphthous fever
- aphyllous
- API
- Apia
- apiaceous
- apian
- apiarian
- apiarist
- apiary
- apical
- apical dominance
- apical meristem
- apices
- apico-
- apicoalveolar
- apicodental
- apicoectomy
- apicomplexan
- A picture is worth a thousand words
- apiculate
- apiculture
- apiculus
- apiece
- à pied
- Apiezon
- API gravity scale
- apiology
- Apis
- apish
