noun, masculine/ˌkumpleˈmes/plural: cumplemeses
monthiversary; mensiversary
“Mañana celebraremos nuestro primer cumplemés de ser pareja.” — Tomorrow we'll celebrate our first monthiversary of becoming a couple.
Synonyms: mesiversario
Verb-object compound, composed of cumple (“to complete”) + mes (“month”), literally “month-completer”.