/ˌsʌpləˈmɛntɚi/
supplementary is pronounced /ˌsʌpləˈmɛntɚi/. Supplementary means added to complete or enhance something else; it provides extra or additional support, information, or materials beyond what is standard. It typically describes content or components that supplement a main set, rather than replacing it, and is commonly used in education, finance, and research contexts.
Say it backSupplementary means added to complete or enhance something else; it provides extra or additional support, information, or materials beyond what is standard. It typically describes content or components that supplement a main set, rather than replacing it, and is commonly used in education, finance, and research contexts.
"The teacher handed out supplementary worksheets to reinforce the lesson."
"We funded supplementary evidence to support the main argument."
"The conference offered supplementary materials online for attendees."
Say /ˌsʌplɪˈmentəri/. The primary stress falls on the third syllable ‘MEN,’ with a light syllable before it. The final -ary is pronounced as /əri/, so the ending sounds like '-uh-ree.' Start with /ˌsʌp/ as in 'sup,' then /lɪ/ (lih), then /ˈmɛn/ (men), then /təri/ (ter-ee). Practice slowly: su-pli-MEN-ta-ry, then blend to /ˌsʌplɪˈmentəri/.
Common errors include stressing the wrong syllable (putting primary stress on 'SU' or 'PLE' instead of 'MEN'), pronouncing the middle consonant cluster too quickly or as /dz/ instead of /d/ or mispronouncing /ə/ in the '-ary' ending. Another frequent issue is softening the /t/ in the 'ment' sequence or reducing /ɪ/ to a schwa too early. To correct: keep the nucleus on /ˈmɛn/ with clear articulation of /t/ before /əri/, and ensure the ending /əri/ stays unstressed.
In US/UK/AU, the core is /ˌsʌplɪˈmentəri/. Rhoticity affects vowel quality: US tends to be rhotic with a more pronounced /ɹ/ in the syllable-final position, while UK varieties can be non-rhotic in careful speech, though some regional accents maintain /ɹ/. Australian tends to be non-rhotic as well, with a slightly drawn-out /ə/ in the -ary ending and a clearer /t/ than US. Stress placement remains on /ˈmɛn/ across these accents.
The difficulty lies in the multi-syllabic structure with a secondary stress pattern and a consonant cluster before the /t/ in 'ment.' The sequence /plɪ/ and the reduced vowel in /əri/ can cause subtle shifts in many speakers, especially if moving quickly. Also, the -ary ending often reduces to /əri/; keeping that light, unstressed ending helps avoid 'airy' or 'ary' mispronunciations. Practice the full word slowly to feel the rhythm.
There are no silent letters in supplementary, but the suffix -ary adds an extra syllable and can influence the preceding stress pattern. The primary stress sits on the penultimate syllable (the third of four): sup-ple-MEN-ta-ry. The 'e' in -ment- is short; the -ary suffix is pronounced as /əri/. Pay attention to the linking from /t/ to /əri/ to avoid clipping the ending.
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Supplementary derives from the noun supplement, which comes from Latin supplementum (a filling up, completion), from Latin complet- ‘filled up’ or plenus ‘full.’ The suffix -ary adds a descriptive meaning of pertaining to. The term evolved in English to describe items that are added to support or complete a main part. First attestations date to the 17th century in academic and legal contexts, where supplementary materials or evidence were referenced to augment the principal records. Over time, supplementary broadened to describe any added content or features that accompany a primary item—for example, supplementary readings, expenses, or data sets—without replacing the core element. The pronunciation and stress pattern, with -ment- ending and -ary suffix, align with other adjectives formed from Latin roots, helping signal its exact relationship to the base noun supplement and the related adjective supplementary.
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Help others use "supplementary" correctly by contributing grammar tips, common mistakes, and context guidance.
💡 These words have similar meanings to "supplementary" and can often be used interchangeably.
🔄 These words have opposite meanings to "supplementary" and show contrast in usage.
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Words that rhyme with "supplementary"
-ary sounds
Practice with these rhyming pairs to improve your pronunciation consistency:
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