- Allopathy
- Allotropism
- Allow
- Allowance
- Allurement
- Alluvion
- Almighty
- Almond
- Almound tree
- Almsgiving
- Almshouse
- Aloe plant
- Aloe spicata
- Aloe vera
- Aloof
- Alopecia
- Alpine
- Alright
- Alsatian
- Also
- Alstonia genus
- Altair
- Altar
- Alter
- Alternative
- Alternative energy
- Alternatively
- Alto
- Alum
- Always
- Am
- Amalgamate
- Amateur
- Amazement
- Amazon
- Ambiance
- Ambiguous
- Ambitious
- Amblyopia
- Ambulatory
- Ameliorative
- 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
- Amusements
- An
- An abuse
- An agonist
- An arm and a leg
- An ascetic
- An ayurvedic treatment
- An edible snail
- An even chance
- An item in phyrotechnics
- An oil-press
- An old head on young shoulders
- Anabolism
- Anacardium occidentale
- Anaemia
- Anaesthetist
- Analogous
- Analogy
- Analysable
- Analyse, analyze
- Anandavardhana
- Anarchism
- Anarchist
- Anasarca
- Anatomist
- Anatomy
- Ancestor
- Ancestry
- Ancient story
- Ancillary
- And a half
- And that's flat
- And the like
- And then
- And things