- Allot
- Allow in
- Allowable
- Allowed
- Alloy
- Allure
- Alluring
- Allusion
- Along with
- Alpha
- Alphanumeric
- Also-ran
- Alstonia scholaris
- Altered
- Alternately
- Alternating current
- Alternation
- Alternator
- Altitude
- Altruism
- Altruistic
- Alu
- Alumna
- Alumnus
- Alzheimer's disease
- Amalgamation
- Amassed
- Amative
- Amazing
- Ambergris
- Amberite
- Ambidextrous
- Ambience
- Ambiguity
- Ambivalence
- Ambulance
- Amelioration
- Amendment
- Amethyst
- Amicably
- Amicue curie
- Amidst
- Amoeba
- Amorphism
- Amorphophallus paeoniifolius
- Amour
- Amour propre
- Amp
- Ampacity
- Ampadi
- Ampersand
- Amphibian
- Amphibious
- Amphorae
- Amputed arm
- Amputee
- Amusedly
- An acquatic plant
- An arrow
- An either or situation
- An electuary
- An expiatory spell
- An ignoramous
- An iron hand in a velvet glove
- An ornament
- An ornament for the neck
- Anabasis
- Anachronism
- Anaconda
- Anaesthetic
- Anal sex
- Analects
- Analgesia
- Analog
- Analystic mind
- Analytic
- Anarchic
- Anarchical
- Anathema
- Anatomize
- Anchorman
- Ancient
- Ancient times
- And that
- Andaman island
- Andragogy
- Androecium
- Andrology
- Andropogon
- Anechoic
- Anelectorde
- Anesthetized
- Angelic
- Angelica
- Angioplasty
- Angle
- Angle-hook
- Angled hook
- Anglo-catholic
- Anglo-saxon