*Actus*, plural *actus* |
A linear measure of 120
Roman feet. A square *actus* was equal to 14,400 square Roman
feet. |

*Ager* |
Land. |

*Ager Arcifinius* |
Unsurveyed land. |

*Ager Publicus* |
Public land. |

*Agrimensor* |
A Roman land surveyor. |

*Cadaster* |
A large scale land survey
undertaken for purposes of taxation. |

*Cardo* |
A *limes* parallel
to the *cardo maximus*. |

*Cardo Maximus* |
One of the two principal
axes (usually N-S) of a *centuriation*. |

*Centuria* |
An area of land equal
to 100 *heredia*. |

*Centuriation* |
*Limitatio*, or,
the division of land in which *limites* divide the land into
regular squares or rectangles. |

*Century* |
A square or rectangle
of a *centuriation* often divided into 100 plots of land. |

*Decumanus* |
A *limes* parallel
to the *decumanus maximus*. |

*Decumanus Maximus* |
One of the two principal
axes (usually E-W) of a *centuriation*. |

*Deductio* |
Foundation of a colony;
the formal act of colonization. |

*Fines* |
Boundary or boundaries. |

*Forma* |
Map or plan. |

*Groma* |
The *groma* was
the principal Roman surveying instrument. It was composed of a vertical
staff with horizontal cross pieces mounted on a bracket. Each cross
piece had a plumb line and plumb bob hanging vertically. Its main
use was to survey straight lines, squares, and rectangles. |

*Heredium* |
An area of land equal
to 2 *iugera,* or 0.504 ha. |

*Insula* |
Island, a city block. |

*Iter* |
Roadway,
journey. |

*iter populo
non debetur* |
"A public
right-of-way does not exist over private land." |

*Iugerum* |
Two square *actus*
or 28,800 square Roman feet or .0252 ha. |

*Limes, Limites* |
A road or track or path
that forms a division between neighboring *centuries*. |

*Limitatio* |
Centuriation or the division
of land by intersecting *Limites*. |

*Mensor* |
Measurer. |

*Mundus* |
Central point of the
city. |

*Per strigas* |
Regular division
of land parallel to the long axis of the colony. |

*Pes* |
Foot. The Roman foot
measure is documented in a number of different measures, usually
0.2957 m. |

*Quintarius* |
A *limes* at a multiple
of 5 *centuries* from one of the two principal axes of a *centuriation*. |

*Rigor* |
Straight line boundary
without width. |

*Subsecivum* |
Unallocated land. |

*Terminus* |
Boundary mark. |

*Territorium* |
Land which is under the
control of a Roman city. |

*Tetrans* |
Main intersection. |