decelerate |
to lower the speed of; decrease in velocity; slow down. |

December |
the twelfth month of the Gregorian calendar year, having thirty-one days. |

decemvir |
one of a council of ten members that drew up the first code of Roman laws in 450 B.C. [2 definitions] |

decency |
the quality, state, or condition of being decent. [3 definitions] |

decennial |
happening every ten years. [3 definitions] |

decent |
conforming to social standards as regards morality, modesty, good taste, or the like; not obscene or offensive. [5 definitions] |

decentralize |
to assign the powers and functions of (a central organization or service) to various local branches or entities. [2 definitions] |

deception |
the act of causing someone to believe an untruth, or the state of being so deceived. [2 definitions] |

deceptive |
able to or tending to deceive; misleading. |

decerebrate |
to separate the brain from the spinal cord of (a person or animal), as by surgery. [3 definitions] |

deci- |
one tenth. |

deciare |
a unit of area equal to ten square meters or 11.96 square yards. |

decibel |
a unit indicating the level of loudness of sound, relative to a standard level, or indicating relative differences in power levels of electrical signals, equal to ten times the common logarithm of the ratio of the two levels. (abbr.: dB) |

decide |
to arrive at a conclusion about or a settlement of; determine. [7 definitions] |

decided |
unquestionable. [2 definitions] |

decidua |
a mucous membrane that lines the uterus and is cast off at childbirth or during menstruation. |

deciduous |
of trees and shrubs, having leaves that drop off seasonally each year. (Cf. evergreen.) [3 definitions] |

decigram |
a unit of weight equal to one tenth of a gram or 1.543 grains. |

decile |
in statistics, any of the values that divide a frequency distribution into ten groups of equal frequency, or any one of these groups. |

deciliter |
a unit of capacity equal to one tenth of a liter or 3.39 fluid ounces. |

decillion |
the number represented by the Arabic numeral 10^{33}. [2 definitions] |