Ludi Saeculares were ancient Roman religious celebrations that were held every 100 years. As such, there are no direct synonyms for this phrase. However, some related concepts and terms could include "centennial celebrations," "century festivals," or "secular games." These terms evoke the idea of an event or ceremony that occurs once every 100 years. Other possible synonyms for elements of Ludi Saeculares could include "sacrificial offerings," "religious rites," or "honoring the gods." Ultimately, while there may not be a singular synonym for Ludi Saeculares, related terminology can help conjure up the significance and ritualistic nature of this ancient religious tradition.