Abdicate
Give up
Abase
Lower, humiliate
Abet
Aid, encourage
Abeyance
Suspended action
Abjure
Renounce upon oath
Ablution
Washing
Abnegation
Self sacrifice
Abortive
Unsuccessful
Abrogate
Abolish
Abscond
Depart secretly and hide
Absolve
Pardon an offense
Abut
Border upon
Abysmal
Bottomless
Accede
Agree
Acclivity
Sharp upslope of a hill
Accommodate
Help someone
Accord
Agreement
Accost
Approach and speak to a person
Accoutre
Equip
Accretion
Growth, increase
Accrue
Come about by addition
Acerbity
Bitterness of speech and temper
Acidulous
Slightly sour, sharp, caustic
Actuarial
Calculating