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decathlon an athletic contest made up of ten different track and field events. Each athlete takes part in all ten events, over a period of two days.
decay to rot or become rotted. [4 definitions]
deceased no longer alive; dead. [2 definitions]
deceit the act of lying or cheating. [2 definitions]
deceive to cause to believe something that is not true; trick or fool.
December the twelfth month of the year. December has thirty-one days. Winter begins in December for people who live north of the equator.
decent proper or suitable. [3 definitions]
deception the act of causing someone to believe something that is not true.
decibel a unit used to measure the loudness of sound. (abbreviated: dB)
decide to settle, choose, or solve. [3 definitions]
deciduous having leaves that drop off each year.
decimal based on the number ten. [3 definitions]
decimal point a period placed between the units and the tenths in decimal numbers. It is used when writing money amounts to separate dollars and cents.
decipher to change from a code into ordinary language. [2 definitions]
decision the act or result of making up one's mind.
decisive able to make firm decisions or end arguments. [2 definitions]
deck the floor on a ship or boat. Sometimes a ship has several decks at different levels. [4 definitions]
declaration the act of declaring or making something known.
Declaration of Independence the public document by which the thirteen American colonies declared their independence from England in 1776.
declarative sentence a sentence that makes a statement. There are many examples of declarative sentences, such as, "It is raining outside."
declare to announce in a formal way. [3 definitions]