acrid.adjective
sharp and harsh or unpleasantly pungent in taste or odor; irritating; deeply or violently bitter; acrimonious (an acrid denunciation) 
acridity, acridness.nouns
acridly.adverb
synonym.caustic

actin.noun
a contractile protein occurring in the form of filaments. Actin is found in the form of filaments of the cytoskeletons of all cells

act.noun
an instrument in writing to verify facts, as an act of parliament; a decision in writing made by a legislative body stating that a thing has been said, done or agreed; signifies the result of a public deliberation of a legistlative body

act.noun
the process of doing or performing something (the act of thinking); a deed (a charitable act); one of the major divisions of a play or an opera
act, acted, acting, acts.verbs
transitive verb use.to play the part of; to perform a role on the stage
intransitive verb use.to behave or comport oneself (he acts like a born leader); to perform in a dramatic role or roles
actability.noun
actable.adjective

acute.adjective
sharp pointed 
inflected form(s).acuter; acutest
marked by keen discernment or intellectual perception especially of subtle.distinctions; penetrating.(an acute thinker); felt, perceived, or experienced intensely (acute insight); responsive to slight impressions or stimuli-(acute hearing); characterized by sharpness or severity (acute pain); having a sudden onset, sharp rise and short course or duration (acute pain); seriously demanding urgent attention
acuteness, acuity-noun
acutely-adverb
acute stresses intensification of conditions leading to a culmination or breaking point (an acute housing shortage); acute suggests severe intensification of an event, condition, etc.
synonyms-critical, crucial 
crucial mean of uncertain outcome; suggests a dividing of the ways and often a test or trial involving the determination of a future course or direction (a crucial vote)

ad hoc.adverb
for the special purpose or end presently under consideration

ad hominem.adjective
attacking one's opponent rather than dealing with the subject under discussion; appealing to one's prejudices, selfish interests, etc., rather than to reason

ad infinitum.adverb
ad infinitum.adjective
to infinity; having no end

ad nauseam.adverb
to a sickening excessive degree; towards mental boredom

adage.noun
an old saying that has been popularly accepted as a truth

adamant.noun
unbreakable hardness; unyielding; firm

adaption.or.adaptation.noun
adaption is a modification that makes a species better able to survive in a particular habitat.

adequate.adjective
sufficient to satisfy a requirement or meet a need
adequateness.noun
adequately.adverb

accuse, accused, accusing, accuses.verbs
transitive verb use.to charge with a shortcoming or an error; to charge formally with a wrongdoing
intransitive verb use.to make a charge of wrongdoing against another
accuser.noun
accusingly.adverb

accusation.noun
an act of accusing or the state of being accused; a charge of wrongdoing that is made against a person or other party

adenine
a purine-derivative; occurs in nucleotides and nucleic acids, RNA and DNA, like guanine.

adenosine.noun
a nucleoside, C₁₀H₁₃N₅O₄ (carbon, hydrogen, nitrogen, oxygen), that is a structural component of nucleic acids and the major molecular component of ADP, AMP, and ATP; a blend of adenine and ribose

adjudicate, adjudicated, adjudicating, adjudicates.transitive verbs
to hear and settle (a case) by judicial procedure; to study and settle a dispute or controversy (had to ask the school principal to adjudicate the quarrel)
adjudication, adjudicator.nouns
adjudicative.adjective

adept.adjective
highly skilled; an expert

abhor, abhorred, abhorring, abhors.transitive verbs
to regard with horror or loathing; abominate; to reject vehemently; shun; to shrink from
abhorrer.noun
abhorrence.noun
one that is disgusting, loathsome, or repellent; a feeling of repugnance or loathing

abhorrent.adjective
disgusting, loathsome, or repellent; feeling repugnance or loathing; being strongly opposed
abhorrently.adverb

abomination.noun
abhorrence; disgust; a cause of abhorrence or disgust
abominate, abominated, abominating, abominates.transitive verbs
to detest thoroughly; abhor; to deprecate as a bad omen
abominator.noun

adhere, adhered, adhering, adheres.intransitive verbs
to stick fast by or as if by suction or glue; to be a devoted follower or supporter; to carry out a plan, a scheme, or an operation without deviation  (we will adhere to our plan)

adherent.adjective
a supporter or follower

adherence.noun
the act, action, or quality of adhering; steady or faithful attachment; fidelity

adhesion.noun
stuck together; in physics: the force that holds together the unlike molecules of substances whose surfaces are in contact (distinguished from cohesion)

adjacent.adjective
lying near; contiguous; neighbouring; bordering
adjacency.noun
adjacently.adverb

accomplice.noun
one who aids or abets a lawbreaker in a criminal act, either as a principal or an accessory; (alteration of complice)

amplify, amplified, amplifying, amplifies.verbs
transitive use.to make larger or more powerful; increase; to add to, as by illustrations; make complete; to exaggerate; to produce amplification of (amplify an electrical signal)
intransitive use.to write or discourse at length; expatiate.(let me amplify so that you will understand the overall problem)

attune, attuned, attuning, attunes.transitive verbs
to bring into a harmonious or responsive relationship (an industry that is not attuned to the demands of the market)
Music.-.to put (an instrument) into correct tune

attrition.noun
a rubbing away or wearing down by friction; a gradual diminution in number or strength because of constant stress; a gradual, natural reduction in membership or personnel, as through retirement, resignation, or from passing on