"bound form" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "bound"
      },
      "expansion": "bound",
      "name": "m"
    },
    {
      "args": {
        "1": "en",
        "2": "form"
      },
      "expansion": "form",
      "name": "m"
    }
  ],
  "etymology_text": "bound + form",
  "forms": [
    {
      "form": "bound forms",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "bound form (plural bound forms)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Mandarin terms with redundant transliterations",
          "parents": [
            "Terms with redundant transliterations",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Linguistics",
          "orig": "en:Linguistics",
          "parents": [
            "Language",
            "Social sciences",
            "Communication",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "a unit of language that can only be used as part of a word, not as a word on its own (such as the English suffix -ly)."
      ],
      "id": "en-bound_form-en-noun-Y1cLgA1j",
      "links": [
        [
          "linguistics",
          "linguistics"
        ],
        [
          "-ly",
          "-ly#English"
        ]
      ],
      "raw_glosses": [
        "(linguistics) a unit of language that can only be used as part of a word, not as a word on its own (such as the English suffix -ly)."
      ],
      "related": [
        {
          "word": "affix"
        },
        {
          "word": "prefix"
        },
        {
          "word": "suffix"
        },
        {
          "word": "infix"
        }
      ],
      "synonyms": [
        {
          "word": "bound morpheme"
        }
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "sciences"
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "niánfù xíngshì",
          "sense": "bound form",
          "word": "黏附形式"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "bound form",
          "word": "sidonnainen morfeemi"
        }
      ],
      "wikipedia": [
        "bound form"
      ]
    }
  ],
  "word": "bound form"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "bound"
      },
      "expansion": "bound",
      "name": "m"
    },
    {
      "args": {
        "1": "en",
        "2": "form"
      },
      "expansion": "form",
      "name": "m"
    }
  ],
  "etymology_text": "bound + form",
  "forms": [
    {
      "form": "bound forms",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "bound form (plural bound forms)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "affix"
    },
    {
      "word": "prefix"
    },
    {
      "word": "suffix"
    },
    {
      "word": "infix"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Mandarin terms with redundant transliterations",
        "en:Linguistics"
      ],
      "glosses": [
        "a unit of language that can only be used as part of a word, not as a word on its own (such as the English suffix -ly)."
      ],
      "links": [
        [
          "linguistics",
          "linguistics"
        ],
        [
          "-ly",
          "-ly#English"
        ]
      ],
      "raw_glosses": [
        "(linguistics) a unit of language that can only be used as part of a word, not as a word on its own (such as the English suffix -ly)."
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "sciences"
      ],
      "wikipedia": [
        "bound form"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "bound morpheme"
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "niánfù xíngshì",
      "sense": "bound form",
      "word": "黏附形式"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "bound form",
      "word": "sidonnainen morfeemi"
    }
  ],
  "word": "bound form"
}