axilla aviation awkward avert avenue avenge available availability avail auxiliary autopsy autonomy autoclave authorize authority authoritative authoritarian authentic Austria auspice auscultate aural augment auditorium audiometer audience attractive audible auction attraction atypical attract attic attenuate attendant attempt attachment attach atropine asymmetric(al) astronomy astronaut astonish asthma assort association astound associate assistant assistance assimilate assignment assign assiduity asset assess assertion assert assassinate assessment assault assembly assemble ashamed aseptic ascertain aspirate asphyxia articulate articular arthritis artery array arrogant arrogance arrest arrangement aroma arrhythmia armament argumentation architecture argue arena arduous architect ardent architectural archaeology arbitrary arch apt apron approximate approve approval appropriate approach apprehend appreciative appreciation appreciate appreciable appraisal appraiser appraise appoint appliance applause applaud appointment appetite appendix appendicitis appalling apparatus anxiety antivirus antiviral apparent antitoxin antiseptic antique antifebrile anticipate antibiotics antenna antacid anoxia anorexia anonymous annoyance annoy animate anhydrous anguish anesthetic anesthesia animation anemia ancient ancestor anatomy analyze ancestry ancestral analogy analogue analysis amusement amuse amputate ample ammonia amid amiable amend amenable ameliorate ambulant ambulance ambiguous ambient ambassador amateur alveolus aluminum alphabet alloy allowance almighty allure allude alliance alleviate alga ague agony agitate agile aggressive affiliate afflict affinity afferent affection afebrile aerobic advocate advisory admonish adequate adduce addict acupuncture acquaint acoustic acne acknowledgement acknowledge acidosis achromatopsia accuse accountant accordance accessory accent absurd abstinence abstain abscess abortion ablate aberrant abrade abate