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Children's Dictionary
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aerial of or happening in the air or atmosphere. [3 definitions]
aerobic able to work the heart and lungs to help the body use oxygen better.
aerobics (used with a singular or plural verb) a form of exercise that works the heart and lungs to help the body use oxygen better. Running, swimming, biking, or dance are forms of aerobics.
aerodynamic having a smooth, even shape that offers the least possible resistance to air currents or movement.
aeronautics (used with a singular verb) a science that deals with making and flying aircraft.
aerosol liquid or solid particles suspended in a gas. [2 definitions]
aerospace the earth's atmosphere and the space beyond it.
aesthetic having to do with beauty or art, including literature, dance, music, painting, drawing, and sculpture.
afar at, to, or from a distance; far off.
a far cry a long way; quite different.
a few a small number of things or people.
affable pleasant to talk to and be with; friendly; likeable.
affair an event, matter, or happening. [5 definitions]
affect1 to cause a change in; influence. [2 definitions]
affect2 to imitate or pretend to have.
affection a friendly feeling of liking or loving someone or something.
affectionate feeling or showing love or affection.
affiliate to join as a member or smaller branch of (usually followed by "with"). [2 definitions]
affirm to state or declare as true.
affirmative saying yes; affirming.
affirmative action a policy to make sure certain groups of people are given a fair chance for jobs and education. In particular, this policy is for minority groups and women who were not given these opportunities in the past. Regulations made by the U.S. government support affirmative action.