Alacer, cheerful; alacrity.
Alo, I nourish; aliment, alimony.
Alter, the other of two; alternation, subaltern.
Altus, high; altitude, exalt.
Ambulo, I walk; amble, perambulator.
Amo, I love; amity, amorous, inimical.
Anima, the soul; animation, inanimate.
Animus, the mind; magnanimity.
Annus, a circle or year; annual, perennial.
Aperio, I open; aperient, April [the opening month, the month of spring when the buds open out].