adj, noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The trigesimal number system; base 30. uncountable

Adjective

1. 1
   Thirtieth. not-comparable, obsolete

   "In the trigesimal year of his reign..."

2. 2
   Containing thirty of something. not-comparable, rare

   "Each month is a roughly trigesimal period."

Synonyms

All synonyms

thirtieththirtieth

Example

More examples

"In the trigesimal year of his reign..."

Etymology

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

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.