| aeration | (noun) the act of charging a liquid with a gas making it effervescent | - |
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| (noun) the process of exposing to air (so as to purify) | - |
| aerator | (noun) an apparatus for exposing something to the air (as sewage) | - |
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| aerial | (noun) a pass to a receiver downfield from the passer | Synonyms: forward pass |
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| (noun) an electrical device that sends or receives radio or television signals | Synonyms: antenna, transmitting aerial |
| aerialist | (noun) an acrobat who performs in the air (as on a rope or trapeze) | - |
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| aerides | (noun) any orchid of the genus Aerides | - |
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| aerie | (noun) any habitation at a high altitude | Synonyms: aery, eyrie, eyry |
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| (noun) the lofty nest of a bird of prey (such as a hawk or eagle) | Synonyms: aery, eyrie, eyry |
| aerobatics | (noun) the performance of stunts while in flight in an aircraft | Synonyms: acrobatics, stunt flying, stunting |
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| aerobe | (noun) an organism (especially a bacterium) that requires air or free oxygen for life | - |
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| aerobics | (noun) exercise that increases the need for oxygen | Synonyms: aerobic exercise |
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| aerobiosis | (noun) life sustained in the presence of air or oxygen | - |
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| aerodontalgia | (noun) pain in the teeth that results from a change in air pressure (as in flying or mountain climbing) | - |
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| aerodrome | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: airdrome, airport, drome |
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| aerodynamics | (noun) the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow | Synonyms: aeromechanics |
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| aeroembolism | (noun) obstruction of the circulatory system caused by an air bubble as, e.g., accidentally during surgery or hypodermic injection or as a complication from scuba diving | Synonyms: air embolism, gas embolism |
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| (noun) pain resulting from rapid change in pressure | Synonyms: air embolism, bends, caisson disease, decompression sickness, gas embolism |
| aerofoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: airfoil, control surface, surface |
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| aerogenerator | (noun) generator that extracts usable energy from winds | Synonyms: wind generator, windmill |
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| aerogram | (noun) a letter sent by air mail | Synonyms: aerogramme, air letter, airmail letter |
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| aerogramme | (noun) a letter sent by air mail | Synonyms: aerogram, air letter, airmail letter |
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| aerolite | (noun) a stony meteorite consisting of silicate minerals | - |
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| aerology | (noun) meteorology of the total extent of the atmosphere; especially the upper layers | - |
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| aeromechanics | (noun) the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow | Synonyms: aerodynamics |
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| aeromedicine | (noun) the study and treatment of disorders associated with flight (especially with space flight) | Synonyms: aerospace medicine, aviation medicine |
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| aeronaut | (noun) someone who operates an aircraft | Synonyms: aviator, flier, flyer |
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| aeronautics | (noun) the theory and practice of navigation through air or space | Synonyms: astronautics |
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| aerophagia | (noun) swallowing air (usually followed by belching and discomfort and flatulence) | - |
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| aerophilately | (noun) the collection and study of airmail stamps | - |
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| aerophile | (noun) a lover of aviation | - |
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| aerophyte | (noun) plant that derives moisture and nutrients from the air and rain; usually grows on another plant but not parasitic on it | Synonyms: air plant, epiphyte, epiphytic plant |
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| aeroplane | (noun) an aircraft that has a fixed wing and is powered by propellers or jets | Synonyms: airplane, plane |
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| aerosol | (noun) a dispenser that holds a substance under pressure and that can release it as a fine spray (usually by means of a propellant gas) | Synonyms: aerosol bomb, aerosol can, aerosol container, spray can |
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| (noun) a cloud of solid or liquid particles in a gas | - |
| aerospace | (noun) the atmosphere and outer space considered as a whole | - |
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| aery | (noun) any habitation at a high altitude | Synonyms: aerie, eyrie, eyry |
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| (noun) the lofty nest of a bird of prey (such as a hawk or eagle) | Synonyms: aerie, eyrie, eyry |
| anaerobe | (noun) an organism (especially a bacterium) that does not require air or free oxygen to live | - |
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| aphaeresis | (noun) (linguistics) omission at the beginning of a word as in `coon' for `raccoon' or `till' for `until' | Synonyms: apheresis |
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| chimaera | (noun) a deep-sea fish with a tapering body, smooth skin, and long threadlike tail | - |
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| (noun) a grotesque product of the imagination | Synonyms: chimera |
| diaeresis | (noun) a diacritical mark (two dots) placed over a vowel to indicate that it does not form a diphthong with an adjacent vowel | Synonyms: dieresis |
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| faerie | (noun) the enchanted realm of fairies | Synonyms: faery, fairyland |
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| (noun) a small being, human in form, playful and having magical powers | Synonyms: faery, fairy, fay, sprite |
| faery | (noun) the enchanted realm of fairies | Synonyms: faerie, fairyland |
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| (noun) a small being, human in form, playful and having magical powers | Synonyms: faerie, fairy, fay, sprite |
| pentaerythritol | (noun) a coronary vasodilator (trade name Peritrate) used to treat angina pectoris | Synonyms: Peritrate |
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| rensselaerite | (noun) a kind of soft talc; sometimes used as wood filler | - |
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| synaeresis | (noun) the separation of liquid from a gel that is caused by contraction (as in cheese making) | Synonyms: syneresis |
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| (noun) the contraction of two vowels into a diphthong | Synonyms: syneresis |