| ai | (noun) a sloth that has three long claws on each forefoot and each hindfoot | Synonyms: Bradypus tridactylus, three-toed sloth |
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| aid | (noun) the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: assist, assistance, help |
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| (noun) the work of providing treatment for or attending to someone or something | Synonyms: attention, care, tending |
| (noun) a person or thing that is a resource that helps make something easier or possible to do | Synonyms: assistance, help |
| (noun) gift of money or other material help to support a person or cause | Synonyms: assistance, economic aid, economic assistance, financial aid, financial assistance |
| (verb) improve the condition of | Synonyms: help |
| (verb) give help or assistance; be of service | Synonyms: assist, help |
| aide | (noun) someone who acts as assistant | Synonyms: auxiliary |
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| (noun) an officer who acts as military assistant to a more senior officer | Synonyms: adjutant, aide-de-camp |
| aided | (adjective) having help; often used as a combining form | Synonyms: assisted |
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| aiglet | (noun) ornamental tagged cord or braid on the shoulder of a uniform | Synonyms: aglet, aiguillette |
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| (noun) metal or plastic sheath over the end of a shoelace or ribbon | Synonyms: aglet |
| aigret | (noun) a long plume (especially one of egret feathers) worn on a hat or a piece of jewelry in the shape of a plume | Synonyms: aigrette |
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| aigrette | (noun) a long plume (especially one of egret feathers) worn on a hat or a piece of jewelry in the shape of a plume | Synonyms: aigret |
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| aiguillette | (noun) ornamental tagged cord or braid on the shoulder of a uniform | Synonyms: aglet, aiglet |
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| aikido | (noun) a Japanese martial art employing principles similar to judo | - |
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| ail | (noun) aromatic bulb used as seasoning | Synonyms: garlic |
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| (verb) be ill or unwell | - |
| (verb) cause bodily suffering to and make sick or indisposed | Synonyms: pain, trouble |
| ailanthus | (noun) any of several deciduous Asian trees of the genus Ailanthus | - |
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| aileron | (noun) an airfoil that controls lateral motion | - |
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| ailing | (adjective) somewhat ill or prone to illness | Synonyms: indisposed, peaked, poorly, seedy, sickly, under the weather, unwell |
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| ailment | (noun) an often persistent bodily disorder or disease; a cause for complaining | Synonyms: complaint, ill |
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| ailurophobia | (noun) a morbid fear of cats | - |
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| aim | (noun) the action of directing something at an object | - |
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| (noun) an anticipated outcome that is intended or that guides your planned actions | Synonyms: design, intent, intention, purpose |
| (noun) the goal intended to be attained (and which is believed to be attainable) | Synonyms: object, objective, target |
| (noun) the direction or path along which something moves or along which it lies | Synonyms: bearing, heading |
| (verb) have an ambitious plan or a lofty goal | Synonyms: aspire, draw a bead on, shoot for |
| (verb) propose or intend | Synonyms: propose, purport, purpose |
| (verb) specifically design a product, event, or activity for a certain public | Synonyms: calculate, direct |
| (verb) direct (a remark) toward an intended goal | - |
| (verb) move into a desired direction of discourse | Synonyms: drive, get |
| (verb) point or cause to go (blows, weapons, or objects such as photographic equipment) towards | Synonyms: direct, take, take aim, train |
| (verb) intend (something) to move towards a certain goal | Synonyms: direct, place, point, target |
| aimless | (adjective) aimlessly drifting | Synonyms: adrift, afloat, directionless, planless, rudderless, undirected |
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| (adjective) continually changing especially as from one abode or occupation to another | Synonyms: drifting, floating, vagabond, vagrant |
| aimlessly | (adverb) without aim; in an aimless manner | - |
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| aimlessness | (noun) the quality of lacking any definite purpose | Synonyms: purposelessness |
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| ain | (adjective) belonging to or on behalf of a specified person (especially yourself); preceded by a possessive | Synonyms: own |
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| aioli | (noun) garlic mayonnaise | Synonyms: aioli sauce, garlic sauce |
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| air | (noun) travel via aircraft | Synonyms: air travel, aviation |
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| (noun) a distinctive but intangible quality surrounding a person or thing | Synonyms: atmosphere, aura |
| (noun) a succession of notes forming a distinctive sequence | Synonyms: line, melodic line, melodic phrase, melody, strain, tune |
| (noun) medium for radio and television broadcasting | Synonyms: airwave |
| (noun) the region above the ground | - |
| (noun) the mass of air surrounding the Earth | Synonyms: atmosphere |
| (noun) a slight wind (usually refreshing) | Synonyms: breeze, gentle wind, zephyr |
| (noun) a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of | - |
| (noun) once thought to be one of four elements composing the universe (Empedocles), associated with the humour blood | - |
| (verb) expose to cool or cold air so as to cool or freshen | Synonyms: air out, vent, ventilate |
| (verb) expose to warm or heated air, so as to dry | - |
| (verb) make public | Synonyms: bare, publicise, publicize |
| (verb) broadcast over the airwaves, as in radio or television | Synonyms: beam, broadcast, send, transmit |
| (verb) be broadcast | - |
| (verb) expose to fresh air | Synonyms: aerate, air out |
| airborne | (adjective) moved or conveyed by or through air | - |
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| airbrake | (noun) a vehicular brake that operates by compressed air; especially for heavy vehicles | - |
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| (noun) a small parachute or articulated flap to reduce the speed of an aircraft | Synonyms: dive brake |
| airbrush | (noun) an atomizer to spray paint by means of compressed air | - |
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| (verb) paint with an airbrush | - |
| airburst | (noun) an explosion in the atmosphere | - |
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| airbus | (noun) a subsonic jet airliner operated over short distances | - |
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| aircraft | (noun) a vehicle that can fly | - |
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| aircraftman | (noun) a noncommissioned officer in the British Royal Air Force | Synonyms: aircraftsman |
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| aircraftsman | (noun) a noncommissioned officer in the British Royal Air Force | Synonyms: aircraftman |
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| aircrew | (noun) the crew of an aircraft | Synonyms: air crew |
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| aircrewman | (noun) a member of an aircrew | - |
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| airdock | (noun) a large structure at an airport where aircraft can be stored and maintained | Synonyms: hangar, repair shed |
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| airdrome | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: aerodrome, airport, drome |
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| airdrop | (noun) delivery of supplies or equipment or personnel by dropping them by parachute from an aircraft | - |
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| aired | (adjective) open to or abounding in fresh air | Synonyms: airy |
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| airfare | (noun) the fare charged for traveling by airplane | - |
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| airfield | (noun) a place where planes take off and land | Synonyms: field, flying field, landing field |
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| airflow | (noun) the flow of air | Synonyms: air flow, flow of air |
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| airfoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: aerofoil, control surface, surface |
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| airforce | (noun) the airborne branch of a country's armed forces | Synonyms: air force |
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| airframe | (noun) the framework and covering of an airplane or rocket (excluding the engines) | - |
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| airfreight | (verb) transport (cargo) by air | Synonyms: air-freight, air-ship |
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| airgun | (noun) a gun that propels a projectile by compressed air | Synonyms: air gun, air rifle |
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| airhead | (noun) a bridgehead seized by airborne troops | - |
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| (noun) a flighty scatterbrained simpleton | - |
| airheaded | (adjective) lacking seriousness; given to frivolity | Synonyms: dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded, silly |
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| airily | (adverb) in a flippant manner | Synonyms: flippantly |
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| airiness | (noun) the property of something weightless and insubstantial | Synonyms: buoyancy |
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| (noun) the property of something spacious and abounding in fresh air | - |
| (noun) lightness in movement or manner | Synonyms: delicacy |
| airing | (noun) the act of supplying fresh air and getting rid of foul air | Synonyms: ventilation |
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| (noun) a short excursion (a walk or ride) in the open air | - |
| (noun) the opening of a subject to widespread discussion and debate | Synonyms: dissemination, public exposure, spreading |
| airless | (adjective) lacking fresh air | Synonyms: close, stuffy, unaired |
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| airlift | (noun) transportation of people or goods by air (especially when other means of access are unavailable) | Synonyms: lift |
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| (verb) fly people or goods to or from places not accessible by other means | Synonyms: lift |
| airlike | (adjective) resembling air or having the form of air | Synonyms: aeriform |
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| airline | (noun) a commercial enterprise that provides scheduled flights for passengers | Synonyms: airline business, airway |
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| (noun) a hose that carries air under pressure | Synonyms: air hose |
| airliner | (noun) a commercial airplane that carries passengers | - |
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| airlock | (noun) a chamber that provides access to space where air is under pressure | Synonyms: air lock |
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| airmail | (noun) a system of conveying mail by aircraft | Synonyms: airpost |
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| (noun) letters and packages that are transported by aircraft | - |
| (verb) send or transport by airmail | - |
| airmailer | (noun) a mailer for airmail | - |
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| airman | (noun) a male who operates an aircraft | - |
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| airmanship | (noun) the art of operating aircraft | Synonyms: aviation |
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| airplane | (noun) an aircraft that has a fixed wing and is powered by propellers or jets | Synonyms: aeroplane, plane |
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| airport | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: aerodrome, airdrome, drome |
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| airpost | (noun) a system of conveying mail by aircraft | Synonyms: airmail |
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| airs | (noun) affected manners intended to impress others | Synonyms: pose |
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| airscrew | (noun) a propeller that rotates to push against air | Synonyms: airplane propeller, prop |
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| airship | (noun) a steerable self-propelled aircraft | Synonyms: dirigible |
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| airsick | (adjective) experiencing motion sickness | Synonyms: air sick, carsick, seasick |
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| airsickness | (noun) motion sickness experienced while traveling by air (especially during turbulence) | Synonyms: air sickness |
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| airspace | (noun) the atmosphere above a nation that is deemed to be under its jurisdiction | - |
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| (noun) the space in the atmosphere immediately above the earth | Synonyms: air space |
| airspeed | (noun) the speed of an aircraft relative to the air in which it is flying | - |
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| airstream | (noun) a relatively well-defined prevailing wind | - |
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| (noun) the flow of air that is driven backwards by an aircraft propeller | Synonyms: backwash, race, slipstream, wash |
| airstrip | (noun) an airfield without normal airport facilities | Synonyms: flight strip, landing strip, strip |
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| airt | (verb) channel into a new direction | Synonyms: redirect |
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| airtight | (adjective) having no weak points | Synonyms: air-tight |
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| (adjective) not allowing air or gas to pass in or out | Synonyms: air-tight, gas-tight |
| airwave | (noun) medium for radio and television broadcasting | Synonyms: air |
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| airway | (noun) a commercial enterprise that provides scheduled flights for passengers | Synonyms: airline, airline business |
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| (noun) a duct that provides ventilation (as in mines) | Synonyms: air duct, air passage |
| (noun) the passages through which air enters and leaves the body | Synonyms: respiratory tract |
| (noun) a designated route followed by airplanes in flying from one airport to another | Synonyms: air lane, flight path, skyway |
| airwoman | (noun) a woman aviator | Synonyms: aviatress, aviatrix |
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| airworthiness | (noun) fitness to fly | - |
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| airworthy | (adjective) (of aircraft) fit to fly | - |
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| airy | (adjective) characterized by lightness and insubstantiality; as impalpable or intangible as air | Synonyms: aerial, aeriform, aery, ethereal |
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| (adjective) having little or no perceptible weight; so light as to resemble air | - |
| (adjective) not practical or realizable; speculative | Synonyms: impractical, Laputan, visionary, windy |
| (adjective) open to or abounding in fresh air | Synonyms: aired |
| aisle | (noun) passageway between seating areas as in an auditorium or passenger vehicle or between areas of shelves of goods as in stores | Synonyms: gangway |
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| (noun) part of a church divided laterally from the nave proper by rows of pillars or columns | - |
| (noun) a long narrow passage (as in a cave or woods) | - |
| aitchbone | (noun) a cut of beef including the H-shaped rump bone | - |
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