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Word definitions, word synonyms and word of the day

Merriam-Webster provides definitions, pronunciations, examples, word histories, synonyms, antonyms, and related words for publicly listed entries, plus Word of the Day entries for today or published archive dates.

Define word

Look up a word or phrase in Merriam-Webster’s dictionary and return pronunciation, meanings, examples, and word history. Only publicly listed dictionary entries are included.

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The word or phrase to look up, for example serendipity.

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Example results

Word
serendipity
Pronunciation
ˌser-ən-ˈdi-pə-tē
Merriam Webster Link
merriam-webster.com
Pronunciation Audio Link
media.merriam-webster.com
Entries
Entries
EtymologyDefinitionsPart of SpeechFirst Known UseExample Sentences
Serendip, variant of Sarandīb, Persian and Arabic name for Sri Lanka + -ity; from its possession by the heroes of the Persian fairy tale The Three Princes of Serendip
1. the ability to find valuable or agreeable things not sought for, 1. also: luck that takes the form of such finding
noun
1754
… materials researchers, who now rely mostly on rules of thumb, trial-and-error and serendipity for developing new materials., As they leapfrog from South Africa to Singapore in search of local delicacies, the authors prove again and again that serendipity is the traveler's strongest ally: many of their most memorable meals issue from the hands of generous strangers …, … the pleasure of wandering while lost and discovering by serendipity interesting new places., … [Sh'Kia] Augustin landed the role through the charmed stroke of serendipity and destiny., For most of his life, he has been blessed with good fortune, tinged with a bit of serendipity.
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About Merriam-Webster

Merriam-Webster (MW) Define word returns pronunciation, definitions, examples, and word history for a word or phrase you provide.

Get synonyms returns meanings, synonyms, antonyms, and related words for a word you provide.

Get word of the day returns a word, meaning, pronunciation, example, and background note; provide a date for an archive entry or omit it for today.

Built by Fous from merriam-webster.com and checked automatically; it last passed a check on Sep 30, 2026. Fous is not affiliated with Merriam-Webster.

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Define word

1 credit per run

Look up a word or phrase in Merriam-Webster’s dictionary and return pronunciation, meanings, examples, and word history. Only publicly listed dictionary entries are included.

What you provide

FieldTypeRequiredDescription
WordwordTextRequiredThe word or phrase to look up, for example serendipity.Example: Run

What you get

FieldTypeDescription
WordwordTextDictionary headword.Example: Serendipity
EntriesentriesListDictionary entries in page order.
Etymologyentries[].etymologyTextExample: Serendip, variant of Sarandīb, Persian and Arabic name for Sri Lanka + -ity…
Definitionsentries[].definitionsListNumbered definitions in displayed order.
Part of Speechentries[].part_of_speechTextExample: Noun
First Known Useentries[].first_known_useTextExample: 1754
Example Sentencesentries[].example_sentencesList
PronunciationpronunciationTextPronunciation shown for the headword.Example: ˌser-ən-ˈdi-pə-tē
Merriam Webster Linkmerriam_webster_linkTextPage for this dictionary word.Example: https://www.merriam-webster.com/dictionary/serendipity
Pronunciation Audio Linkpronunciation_audio_linkTextLink to the pronunciation audio when available.Example: https://media.merriam-webster.com/audio/prons/en/us/mp3/s/serend02.mp3

Example result

For Word: Serendipity

JSON
{
  "word": "serendipity",
  "entries": [
    {
      "etymology": "Serendip, variant of Sarandīb, Persian and Arabic name for Sri Lanka + -ity; from its possession by the heroes of the Persian fairy tale The Three Princes of Serendip",
      "definitions": [
        "1. the ability to find valuable or agreeable things not sought for",
        "1. also: luck that takes the form of such finding"
      ],
      "part_of_speech": "noun",
      "first_known_use": "1754",
      "example_sentences": [
        "… materials researchers, who now rely mostly on rules of thumb, trial-and-error and serendipity for developing new materials.",
        "As they leapfrog from South Africa to Singapore in search of local delicacies, the authors prove again and again that serendipity is the traveler's strongest ally: many of their most memorable meals i…",
        "… the pleasure of wandering while lost and discovering by serendipity interesting new places."
      ]
    }
  ],
  "pronunciation": "ˌser-ən-ˈdi-pə-tē",
  "merriam_webster_link": "https://www.merriam-webster.com/dictionary/serendipity",
  "pronunciation_audio_link": "https://media.merriam-webster.com/audio/prons/en/us/mp3/s/serend02.mp3"
}

Get synonyms

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Get a word’s thesaurus meanings, examples, synonyms, antonyms, and related words from its public Merriam-Webster page.

What you provide

FieldTypeRequiredDescription
WordwordTextRequiredA word to look up in the thesaurus, for example happy.Example: Happy

What you get

FieldTypeDescription
WordwordTextThe word shown on the thesaurus page.Example: Happy
MeaningsmeaningsListMeanings in the order they appear on the page. Similar words appear under synonyms; related words are included only when shown separately.
Meaningmeanings[].meaningTextExample: experiencing pleasure, satisfaction, or delight
Antonymsmeanings[].antonymsList
Synonymsmeanings[].synonymsList
Page Linkmeanings[].page_linkTextExample: https://www.merriam-webster.com/thesaurus/happy#thesaurus-entry-1-1
Related Wordsmeanings[].related_wordsList
Part of Speechmeanings[].part_of_speechTextExample: Adjective
Example Sentencemeanings[].example_sentenceTextExample: made bread for the first time and was happy with the tasty result
Thesaurus Linkthesaurus_linkTextLink to the word’s thesaurus page.Example: https://www.merriam-webster.com/thesaurus/happy

Example result

For Word: Happy

JSON
{
  "word": "happy",
  "meanings": [
    {
      "meaning": "experiencing pleasure, satisfaction, or delight",
      "antonyms": [
        "unhappy",
        "sad",
        "dissatisfied"
      ],
      "synonyms": [
        "delighted",
        "pleased",
        "glad"
      ],
      "page_link": "https://www.merriam-webster.com/thesaurus/happy#thesaurus-entry-1-1",
      "related_words": [],
      "part_of_speech": "adjective",
      "example_sentence": "made bread for the first time and was happy with the tasty result"
    },
    {
      "meaning": "coming or happening by good luck especially unexpectedly",
      "antonyms": [
        "unhappy",
        "unfortunate",
        "unlucky"
      ],
      "synonyms": [
        "lucky",
        "fortunate",
        "convenient"
      ],
      "page_link": "https://www.merriam-webster.com/thesaurus/happy#thesaurus-entry-1-2",
      "related_words": [],
      "part_of_speech": "adjective",
      "example_sentence": "a happy discovery, finding the letter that would prove her innocence"
    },
    {
      "meaning": "feeling that one's needs or desires have been met",
      "antonyms": [
        "unhappy",
        "dissatisfied",
        "displeased"
      ],
      "synonyms": [
        "satisfied",
        "pleased",
        "contented"
      ],
      "page_link": "https://www.merriam-webster.com/thesaurus/happy#thesaurus-entry-1-3",
      "related_words": [],
      "part_of_speech": "adjective",
      "example_sentence": "has been much happier ever since she moved"
    }
  ],
  "thesaurus_link": "https://www.merriam-webster.com/thesaurus/happy"
}

Get word of the day

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Get Merriam-Webster’s Word of the Day for today or a past archive date, with its meaning, example, pronunciation, and background note. Dates without a published entry are unavailable.

What you provide

FieldTypeRequiredDescription
DatedateDateOptionalDay to look up (YYYY-MM-DD), such as 2025-02-15. Omit for today.Example: 2025-02-15

What you get

FieldTypeDescription
DatedateDatePublication date.Example: 2026-09-28
LinklinkTextWord of the Day page link.Example: https://www.merriam-webster.com/word-of-the-day/fungible-2026-09-28
WordwordTextWord of the Day.Example: Fungible
DefinitiondefinitionTextMeaning in plain text.Example: Fungible describes things, such as currency, goods, and commodities, that can…
Did You Knowdid_you_knowTextDid You Know? note in plain text.
PronunciationpronunciationTextPronunciation shown on the page.Example: FUN-juh-bul
Part of Speechpart_of_speechTextPart of speech shown on the page.Example: Adjective
Example Sentenceexample_sentenceTextUsage example in plain text.Example: A dollar bill is considered fungible because it can easily and acceptably be…

Example result

For

JSON
{
  "date": "2026-09-28",
  "link": "https://www.merriam-webster.com/word-of-the-day/fungible-2026-09-28",
  "word": "fungible",
  "definition": "Fungible describes things, such as currency, goods, and commodities, that can be exchanged for something else of the same kind or value. In broader usage, fungible can also mean “interchangeable,” as …",
  "did_you_know": "Before expectations about the origins of fungible mushroom into mycological fantasy: no, fungible has no relation to the noun fungus and its plural fungi. The fungi in fungible is there because of the…",
  "pronunciation": "FUN-juh-bul",
  "part_of_speech": "adjective",
  "example_sentence": "A dollar bill is considered fungible because it can easily and acceptably be traded for ten dimes, four quarters, twenty nickels, or one hundred pennies, as well as any other dollar bill."
}

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# First set your key: export FOUS_API_KEY='YOUR_FOUS_API_KEY'
: "${FOUS_API_KEY:?Set FOUS_API_KEY before running this example}"

curl 'https://api.fous.com/v1/query' \
  --fail-with-body --silent --show-error --max-time 120 \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H 'Content-Type: application/json' \
  --data-raw '{
  "api": "@merriam-webster",
  "visibility": "public",
  "operation": "define_word",
  "version": 1,
  "input": {
    "word": "run"
  },
  "response": {
    "format": "json"
  }
}'

What you can do with it

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