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Children's Dictionary
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active always doing something; busy; full of energy. [2 definitions]
actively in a way that involves making an effort, taking action, or participating.
activist a person who fights openly and vigorously for a cause.
activity the condition of being active or doing something. [2 definitions]
actor a person who acts a part in a play, a movie, or a radio or television program.
actress a woman or girl who plays a part in movies, television, plays, or radio.
actual truly existing, or being something that is real or true.
actually as a matter of fact; really.
act up to behave in a bad or mischievous way; misbehave. [2 definitions]
acupuncture the practice of relieving pain or curing a disease by putting needles into certain parts of the body. Acupuncture is a traditional way to treat disease in China.
acute sharp; severe. [4 definitions]
acute angle an angle of less than ninety degrees.
A.D. after the birth of Jesus Christ. A.D. is an abbreviation for anno domini, which means "in the year of the Lord" in Latin. Something that happened in A.D. 50 happened fifty years after the birth of Christ.
ad advertisement.
adage an old familiar saying that shows the wisdom of a group of people; proverb.
adapt to change for a particular use. [2 definitions]
adaptable abed to be changed in order to serve a different purpose or work in a new way. [2 definitions]
adaptation the act or process of changing or adjusting something to fit in a new role or context. [4 definitions]
add to put on or with something else to make larger or better. [5 definitions]
added further; extra.
addend a number or amount added to another to form a sum.