trigesimal

English

Etymology

From Latin trigesimus (“thirtieth”) + -al (“forming adjectives”).

Adjective

trigesimal (not comparable)

  1. (obsolete) Thirtieth.
    In the trigesimal year of his reign...
  2. (rare) Containing thirty of something.
    Each month is a roughly trigesimal period.

References
  • Oxford English Dictionary, "trigesimal, adj."
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