- Allopathy
- Allotropism
- Allow
- Allowance
- Allurement
- Alluvion
- Almighty
- Almond
- Almound tree
- Alternative
- Alternative energy
- Alternatively
- Alto
- Alum
- Always
- Am
- Amalgamate
- Amateur
- American football
- American indian
- Americanism
- Americium
- Amerindian
- Amiability
- Amiableness
- Amicus curiae
- Amid
- Ammunition
- Amniocentesis
- Among
- Amorality
- Amorous
- Amortize
- Amperage
- Ampere
- Amplifier
- Amplify
- Amply
- Ampoule
- Amputate
- Amuck
- Amusement
- Anabolism
- Anacardium occidentale
- Anaemia
- Anaesthetist
- Analogous
- Analogy
- Analysable
- Analyse, analyze
- Anandavardhana
- Anarchism
- Anarchist
- Anasarca
- Anecdote
- Anemia
- Anencephalus
- Anent
- Anesthetic
- Anesthetist
- Aneurysms
- Anger
- Angina
- Angiras
- Anglicize
- Angling
- Anglo
- Anglophone
- Angora
- Angry
- Annihilated
- Annihilation
- Annualized
- Annuity
- Annus mirabilis
- Anodise
- Anomalous
- Anonym
- Anus
- Anterior
- Anther
- Anthrop
- Anthropocentric
- Anthropological
- Anthropologist
- Anti-revolutionary
- Anti-semitic
- Antibody
- Antic
- Antichrist
- Anxiety
- Anxious
- Anxiousness
- Any day
- Any small bird
- Anything
- Anything solid
- Anythink
- Apathetic
- Apercu