Words starting with A that are validated

• architectural engineering — Noun – English ～ the branch of engineering that deals with the construction of buildings (as distinguished from architecture as a design art)
• automotive engineering — Noun – English ～ the activity of designing and constructing automobiles
• aeronautical engineering — Noun – English ～ the branch of engineering science concerned with the design and construction of aircraft
• aeronautical engineering — Noun – English ～ the activity of designing and constructing aircraft
• African American English — Noun – English ～ a nonstandard form of American English characteristically spoken by African Americans in the United States
• American English — Noun – English ～ the English language as used in the United States
• abstract entity — Noun – English ～ a general concept formed by extracting common features from specific examples
• accounting entry — Noun – English ～ a written record of a commercial transaction
• adjusting entry — Noun – English ～ an accounting entry made at the end of an accounting period to allocate items between accounting periods
• angiotensin-converting enzyme — Noun – English ～ proteolytic enzyme that converts angiotensin I into angiotensin II
• angiotensin converting enzyme — Noun – English ～ proteolytic enzyme that converts angiotensin I into angiotensin II
• Archean eon — Noun – English ～ the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
• Archeozoic eon — Noun – English ～ the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
• Artemision at Ephesus — Noun – English ～ the large temple of the Greek goddess Artemis which was begun at Ephesus in 541 BC and completed 220 years later; the temple was destroyed by the Goths in 262
• Anomia ephippium — Noun – English ～ thin-shelled bivalve having the right valve deeply notched
• arteria epigastrica — Noun – English ～ one of three arteries supplying the anterior walls of the abdomen
• akinetic epilepsy — Noun – English ～ epilepsy characterized by akinesia
• acid-base equilibrium — Noun – English ～ (physiology) the normal equilibrium between acids and alkalis in the body; "with a normal acid-base balance in the body the blood is slightly alkaline"
• autumnal equinox — Noun – English ～ September 22
• autumnal equinox — Noun – English ～ (astronomy) the equinoctial point that lies in the constellation of Virgo

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