**Quatreme** (**q** or **qat**) is a unit of time equal to ^{1}⁄_{3600} of a second, 0.27 milliseconds, or ^{1}⁄_{60} of a tierce. Quatreme comes from the French word *quatrième*, meaning "fourth", because this unit is two steps in magnitude from second. I chose French as the origin of this word since it has 'treme' embedded in it that would seem to be a portmanteau of quarter and extreme as this is the smallest unit of the series of units in factors of 60 from other units that includes hours, minutes, seconds, tierces, and quatremes.

The Earth's day is lengthening by 6.5 quatremes per century.

is equal to | |
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1 tierce | 60 q |

1 second | 3600 q |

1 minute | 216000 q |

1 moment | 324000 q |

1 canor | 864000 q |

1 hour | 12 960 000 q |

1 seret | 25 920 000 q |

1 pardie | 77 760 000 q |

1 work | 103 680 000 q |

1 day | 311 040 000 q |

1 week | 2 177 280 000 q |

1 fortnight | 4 354 560 000 q |

1 month | 9 467 280 000 q |

1 season | 28 401 840 000 q |

1 year | 113 607 360 000 q |