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a hard row to hoe a very difficult task or situation.
ahead in front of; in advance of. [6 definitions]
ahead of time before the time of some event.
ahem a sound as of clearing the throat, used to attract notice, express doubt, or fill in a pause.
ahimsa (Sanskrit) the principle of nonviolence based on the belief in the sacredness of all living creatures, as held by Buddhists, Hindus, and others.
A horizon the uppermost layer of soil in a geological soil profile; topsoil.
ahoy a greeting to attract attention or hail a ship.
ahtomp in Wampanoag language and culture, a weapon used for shooting arrows; bow.
Ahura Mazda in Zoroastrianism, the supreme deity and creator of the world; Ormazd.
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.