Palversary 

Pets in the same household that sometimes start as adversaries but slowly become pals, some of the time, but can flip back to adversaries any moment. The pet version of frenimy.

Our older cat has begrudgingly accepted the kitten as a worthy palversary.

Palversary by YellekG June 14, 2019

preversary

the prequel to the anniversary. If someone is getting married a year from today, today would be the preversary. Another excuse for a woman to get upset when her man forgets their preversary.

Girlfriend: Happy Preversary Baby!
Boyfriend: What's a preversary?
Girlfriend: Next year on this day we'll be (getting engaged, married)
Boyfriend: Uhhh ok

preversary by thatg1rl December 2, 2009

polyversary 

The yearly reoccurrence of the date on which, two or more people in an open relationship, celebrate their love. It could be the annual commemoration of an open marriage but does not have to include a committment ceremony, It may be celebrated by any form of non-monogamous relationship that involves multiple people. It could be a celebration of the first date, the first kiss, or the day they became official on Facebook. It may be celebrated by couples, triads, quads, or any number of other poly configurations.

I'm frustrated that his polyversary with his girlfriend is not legitimized by society the way that a legal marriage would be.

or
This month marks my seven-year polyversary with James and Sharmila, our triad became official at the pride festival when we made polyamory signs and marched in the parade.

or
My polversary with Michael is easy to remember because it always falls on Valentines.

polyversary by Blisscoach June 30, 2023

panaversary 

the day the US announced that Covid-19 was officially a pandemic

2024, March 13 marks the panaversary

panaversary by oliver55 March 19, 2024