Definitions

1. adjective

having no months, especially because it is a year of the 13-month calendar used by some ancient cultures.

“The 13-month calendar, also known as the Hanke-Henry Permanent Calendar, is menseless, which simplifies date calculations.”

2. noun

a year of the 13-month calendar, especially the Hanke-Henry Permanent Calendar.

“The menseless year is gaining popularity among some calendar enthusiasts.”