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ai1 used as an expression of distress, pity, surprise, or the like.
ai2 a large three-toed sloth of Central and South America, whose coat has a greenish tinge from the algae that live in it.
aid to provide assistance, help, or relief to. [4 definitions]
aide a military officer who serves as confidential assistant to a commanding officer such as a general. [2 definitions]
aide-de-camp a military or naval officer serving as assistant to a general or admiral.
aidman an enlisted medical corpsman attached to a combat unit.
AIDS acronym of "acquired immune deficiency syndrome," a usu. fatal viral disease of the body's immune system, transferred through blood, sexual contact, contaminated hypodermic needles, or the like.
AIDS-related complex a condition characterized by enlargement of the lymph nodes that may be an early sign of AIDS.
aigrette a head ornament made of an upright tuft of egret tail feathers.
aikido a system of self-defense, originating in Japan, in which an opponent's strength and weight are used against him or her by using specific throws and holds.
ail to distress or cause illness or discomfort to. [2 definitions]
ailanthus a deciduous tree, originating in Asia, with fernlike leaves and clusters of greenish flowers with an offensive odor.
aileron a movable flap on the rear edge of an airplane's wing, used to control rolling and banking.
ailing in poor or weakened health or condition; sickly or sick.
ailment a sickness or disorder, usu. physical; illness.
aim to point carefully (usu. a weapon), with the intention of hitting a target. [8 definitions]
aimless characterized by or having no purpose.
ain't (informal) contracted form of "am not," "is not," "are not," "have not," or "has not."
Ainu a member of an aboriginal people native to the northernmost islands of Japan, noted for their ample body hair. [3 definitions]
aioli a rich sauce, similar to mayonnaise, made of crushed garlic, egg yolks, lemon juice, and olive oil, served with vegetables, fish, and seafood.
air the tasteless, odorless, and colorless mixture of nitrogen, oxygen, and other gases that forms the earth's atmosphere. [8 definitions]