"zero-grade" meaning in English

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  "etymology_templates": [
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      "args": {
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        "2": "zero",
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      "expansion": "zero + grade",
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    {
      "args": {
        "1": "en",
        "2": "de",
        "3": "Nullstufe",
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      "expansion": "German Nullstufe",
      "name": "cal"
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  ],
  "etymology_text": "From zero + grade, as in gradation (“apophony”). Possibly after German Nullstufe.",
  "forms": [
    {
      "form": "zero-grades",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "zero grade",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "zero-grade (plural zero-grades)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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            "Entries with incorrect language header",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Indo-European studies",
          "orig": "en:Indo-European studies",
          "parents": [
            "Linguistics",
            "Language",
            "Social sciences",
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          "kind": "topical",
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          "name": "Zero",
          "orig": "en:Zero",
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            "All topics",
            "Terms by semantic function",
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          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "bʰr̥- is the zero-grade of the Indo-European root *bʰer- meaning “to carry, bear”.",
          "type": "example"
        }
      ],
      "glosses": [
        "In Proto-Indo-European linguistics, an ablaut form of a root characterized by the absence of the basic ablauting vowel phonemes */e/ and */o/."
      ],
      "id": "en-zero-grade-en-noun-bZYSsrnj",
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          "linguistics",
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          "ablaut",
          "ablaut"
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      "raw_glosses": [
        "(Indo-European linguistics) In Proto-Indo-European linguistics, an ablaut form of a root characterized by the absence of the basic ablauting vowel phonemes */e/ and */o/."
      ],
      "synonyms": [
        {
          "word": "vanishing grade"
        }
      ],
      "translations": [
        {
          "code": "da",
          "lang": "Danish",
          "sense": "Translations",
          "tags": [
            "neuter"
          ],
          "word": "nultrin"
        },
        {
          "code": "nl",
          "lang": "Dutch",
          "sense": "Translations",
          "tags": [
            "masculine"
          ],
          "word": "nultrap"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "Translations",
          "tags": [
            "feminine"
          ],
          "word": "Schwundstufe"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "Translations",
          "tags": [
            "feminine"
          ],
          "word": "Nullstufe"
        }
      ]
    }
  ],
  "word": "zero-grade"
}

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    {
      "args": {
        "1": "en",
        "2": "zero",
        "3": "grade"
      },
      "expansion": "zero + grade",
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    },
    {
      "args": {
        "1": "en",
        "2": "de",
        "3": "Nullstufe",
        "notext": "1"
      },
      "expansion": "German Nullstufe",
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    }
  ],
  "etymology_text": "From zero + grade, as in gradation (“apophony”). Possibly after German Nullstufe.",
  "forms": [
    {
      "form": "zero-grades",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "zero grade",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "zero-grade (plural zero-grades)",
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  "pos": "noun",
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        }
      ],
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          "linguistics"
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          "Proto-Indo-European"
        ],
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          "ablaut",
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        ],
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        ]
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        "(Indo-European linguistics) In Proto-Indo-European linguistics, an ablaut form of a root characterized by the absence of the basic ablauting vowel phonemes */e/ and */o/."
      ],
      "synonyms": [
        {
          "word": "vanishing grade"
        }
      ]
    }
  ],
  "translations": [
    {
      "code": "da",
      "lang": "Danish",
      "sense": "Translations",
      "tags": [
        "neuter"
      ],
      "word": "nultrin"
    },
    {
      "code": "nl",
      "lang": "Dutch",
      "sense": "Translations",
      "tags": [
        "masculine"
      ],
      "word": "nultrap"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "Translations",
      "tags": [
        "feminine"
      ],
      "word": "Schwundstufe"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "Translations",
      "tags": [
        "feminine"
      ],
      "word": "Nullstufe"
    }
  ],
  "word": "zero-grade"
}