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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.
consonant a sound in a language made by stopping or restricting the flow of air through the mouth using speech organs such as the tongue, teeth, or lips. The sounds represented by the letters "d," "k," "b," "s," and "m" are examples of consonants in English. [1/2 definitions]
Covid-19 a serious, sometimes fatal, disease caused by a certain type of virus called a "coronavirus." This particular coronavirus broke out for the first time in 2019, and the disease spread all over the world in 2020. "Co" in Covid stands for "corona," "vi" stands for "virus," and "d" stands for "disease." The number 19 refers to the year 2019. The name "Covid-19" is oftened shortened to "Covid."
division sign a mathematical sign made up of a small horizontal line with one dot above it and one dot below it ( ). It indicates that the number coming before it is to be divided by the number coming after it.
emoticon (from emotion icon) a small icon made of punctuation characters and letters that is placed in an e-mail; smiley. An emoticon shows the mood of the writer, such as :-( and :-D
Jesus Christ the teacher and prophet who founded the Christian faith. He is considered by Christians to be the son of God and the Christ or savior. Jesus lived from about 4 B.C. to 29 A.D.
Middle Ages the period of European history between ancient times and the Renaissance, from A.D. 500 to A.D. 1500.
Muhammad an Arab religious leader and the person who started Islam. He lived from A.D. 570 to A.D. 632.
Ph.D. a degree that is earned following college after several years of additional study and the completion of a major research project. "Ph.D." is an abbreviation of Latin words which mean "Doctor of Philosophy."
Potomac a river of the eastern United States. It flows from West Virginia along the border of Washington, D.C., and into the Atlantic Ocean.
Roman numeral a letter used as a number in the ancient Roman number system. The letter I equals 1, V equals 5, X equals 10, L equals 50, C equals 100, D equals 500, and M equals 1,000. In this system, a letter followed by one of equal or lesser value means the two are added; seven is VII, or 5+1+1. A letter followed by one of greater value means that the first is subtracted from the second; four hundred is CD, or 500-100.
United States of America a country in North America (usually used with "the"). Washington, D.C., is the capital of the United States of America.
Viking (sometimes lower case) any of the Scandinavian sea warriors and traders who were active from around A.D. 700 to 1100. The Vikings raided the coasts of Europe and settled parts of Britain, western Europe, Russia, and elsewhere.
White House the official home of the President of the United States in Washington, D.C. (used with "the"). [1/2 definitions]