- aviation medicine
- avicenna
- aviational
- avicennia officinalis
- aviatophobia
- avicennia
- aviatress
- avicennia marina
- avicenniaceae
- avifaunistic
- avidness
- avignon
- aviophobia
- avionics
- avifaunal
- avitaminosis
- avocado
- avocado tree
- avocado pear
- avogadro
- avogadro number
- avogadro's number
- avoirdupois unit
- avogadro's hypothesis
- avon
- avoid like the plague
- avogadro's law
- avoirdupois weight
- avoirdupois
- avouch
- avow
- avouchment
- avower
- avuncular
- awake
- avowedly
- awaken to
- awake to
- awakened
- awakening
- activated charcoal
- adamant
- activated carbon
- abcoulomb
- ampere_hour
- ampere_minute
- aleph_null
- aleph_nought
- aleph_zero
- airspeed