trigesimal
English
Etymology
From Latin trigesimus (“thirtieth”) + -al (“forming adjectives”).
Adjective
trigesimal (not comparable)
- (obsolete) Thirtieth.
- In the trigesimal year of his reign...
- (rare) Containing thirty of something.
- Each month is a roughly trigesimal period.
References
- Oxford English Dictionary, "trigesimal, adj."