Thirtieth

//ˈθɜːti.əθ// adj, noun

adj, noun ·Uncommon ·Advanced level

Definitions

Noun
  1. 1
    The person or thing in the thirtieth position.
  2. 2
    position 30 in a countable series of things wordnet
  3. 3
    One of thirty equal parts of a whole.
Adjective
  1. 1
    The ordinal form of the number thirty. not-comparable
Adjective
  1. 1
    coming next after the twenty-ninth in position wordnet

Synonyms

All synonyms
30th30th30thtrigesimaltrigesimal

Example

More examples

"Thirtieth birthdays often bring with them fears of old age."

Etymology

From earlier thirteth, from Middle English thrittithe, threttiþe, thrittyde, from Old English þrītigoþa; equivalent to thirty + -eth. For the modern form, see the etymological notes at twentieth.

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