Thirtieth is the ordinal adjective form of thirty, used to denote the number that comes after twenty-ninth. It’s spoken with two syllables in many accents, combining the base /ˈθɜːr/ (or /ˈðɜːr/ in some dialects) with a light, final /tiːəθ/ or /tiːð/ sequence. The stress is on the first syllable; the ending cluster can sound like -teenth due to the /tiː/ + θ or /tiːð/ realization.
"I was born on the thirtieth of March."
"The thirtieth chapter covers advanced topics."
"We met at the thirtieth anniversary celebration."
"She ranked thirtieth in the race."
Thirtieth derives from the numeral thirty, formed in Middle English as thirtieth from Old English þrīti, with the suffix -est/-th representing ordinal derivation. The word thirtieth combines the cardinal number thirty with the ordinal suffix -th to indicate position in a sequence. Historically, the term reflects a Germanic root lineage, with cognates across Scandinavian languages. First evidence appears in early English texts around the 12th–13th centuries, where thirtieth is attested in calendrical and ordinal contexts. The pronunciation shifted over time; early forms often pronounced the final cluster more clearly as /-tiəθ/ or /-tiːθ/, while modern English tends to a reduced, faster /-tiːθ/ or /-tiːð/ depending on dialect. The orthographic t-i-e-t-h captures the historical tension between -eth endings and the modern -th suffix, a marker of ordinal numbers in English. The word’s meaning remained stable—denoting the ordinal position of the number thirty in a sequence—though its phonetic realization has diversified regionally with rhoticity and vowel quality influencing the first syllable’s vowel and onset.
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Words that rhyme with "Thirtieth"
-ath sounds
-eth sounds
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Pronounce as two syllables with primary stress on the first: /ˈθɜːrtiˌeɪθ/ (US/UK) or /ˈθɜːtiˌiːθ/. Begin with the unvoiced dental fricative /θ/ (thin) or /ð/ in some speakers, then the rhotic /ɜː/ vowel, followed by /r/ in rhotic accents, then /ti/ and an ending /eɪθ/ or /iːθ/. The key is crisp release on /t/ and a clear, final /θ/ or /ð/ sound. Listen to a native speaker saying “thirtieth” in context: you’ll hear the two-syllable rhythm with a strong first syllable and a sharp, trailing th.”
Common errors include misplacing the stress (treating it as /ˈθɜːrtiːθ/ with a long -ee- vowel) and mispronouncing the ending as /-θ/ without voice or as /-th/ as /f/ or /v/. Another frequent slip is merging /ti/ with /θ/ into /tθ/ or saying /ˈθɜːrtiː θ/ with an extra space. To correct: keep the final cluster tight—end with a voiceless dental fricative /θ/ or voiced /ð/ depending on locale—avoid vowel prolongation in the second syllable and ensure the /t/ is clearly released before the final /θ/.”
US and UK typically share /ˈθɜːrtiˌeɪθ/ or /ˈθɜːtiˌiːθ/ with the second syllable gliding to /eɪ/ or /iː/. US may retain rhotic /ɜːr/ as in /ˈɜːr/ whereas UK often sounds less rhotic in fast speech. Australian English can show a slightly flatter /ɜː/ vowel and a longer /iː/ before the final /θ/; some speakers insert a light /j/ before /t/ making /ˈθɜːrtiˌj eɪθ/. All emphasize the /θ/ at the end but with subtle vowel quality differences.
The difficulty lies in the final cluster /tiːθ/ or /tiːð/ after a stressed initial syllable, requiring precise articulation of the /t/ release followed by a voiceless/voiced dental fricative. The initial /θ/ or /ð/ must be place-accurate (teeth-on-tongue) and not coalesced with /r/ or vowel. Additionally, some speakers reduce the ending to /-θ/ or mispronounce as /-st/ due to rapid speech. Focusing on the two-syllable rhythm and the final dental fricative helps accuracy.
A unique feature is the interplay between the stressed first syllable and the final dental fricative, which can be realized as either /θ/ (unvoiced) or /ð/ (voiced) depending on dialect and emphasis. Some speakers also insert a subtle /j/ transition before the /t/ in rapid speech, producing /ˈθɜːrtiˌj eɪθ/ or /ˈθɜːtiˌj iːθ/. Paying attention to the dental place of articulation and keeping the /t/ released crisply makes this feature sound natural.
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