absternious	sparing in eating and drinking, temperate
abstinence	restraint from eating or drinking
abstract	theoretical, not concrete, nonrepresentational
abstrude	obscure, profund, difficult to understand
abusive	coarsely insulting/ physically harmful
to abut	to border upon, to adjoin
abysmal	bottomless
abyss	enormous chasm, a vast bottomless pit
academic	related to a school/ not practical or directly useful
to accede	to agree
to accelerate	to move faster
accessible	easy to approach, obtainable
accessory	additional object, useful but not essential
to acclaim	to applaud, to announce with great approval
to acclimate	to adjust to a climate
acclivity	sharp upslope of a hill
accolade	award of merit
accomplice	a partner in a crime
accord	agreement
to accost	to approach and speak first to a person
to accoutre	to equip
accretion	growth, increase
to accrue	to come about by addition
acerbity	bitterness of speech and temper
acetic	vinegary
to acknowledge	to recognize, to admit
acidulous	slightly sour, sharp, coustic
acme	top, pinnacle
acoustics	science of sound/ quality that makes a room easy or hard to hear in
to acquiesce	to assent, to agree without protesting
to acquire	to get, to obtain
acquittal	deliverance from a charge
acrid	sharp, bitterly pungent
acrimonious	bitter in words or manner
acrophobia	fear of heights
to actuate	to motivate
acuity	sharpness
acumen	mental keenness
acute	quickly perceptive, keen, brief and severe
adage	wise saying, proverb
adamant	hard, inflexible
to adapt	to alter, to modify
addendum	an addition or supplement
addiction	compulsive, habitual need
to addle	to muddle/ to drive crazy/ to become rotten
to adress	to direct a speech to sb/ to deal with or discuss
adept	(adj.) expert at sth