Not for points Homework / test Da Inglese a Italiano Tecnico/Meccanico Computer: Software CAD terms

Integrating motion simulation with CAD simplifies design because the simulation uses information that already exists in the CAD model, such as assembly mates, couplings, and material mass properties.

These are terms used in CAD software, I can't find the proper word to translate assembly mates, I have translated the other 2 terms but I would like to know what you would use.