"variable costs" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "noun form",
        "head": "variable costs"
      },
      "expansion": "variable costs",
      "name": "head"
    }
  ],
  "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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Accounting",
          "orig": "en:Accounting",
          "parents": [
            "Finance",
            "Business",
            "Economics",
            "Society",
            "Social sciences",
            "All topics",
            "Sciences",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "variable cost"
        }
      ],
      "glosses": [
        "plural of variable cost"
      ],
      "id": "en-variable_costs-en-noun-klmCo0P5",
      "links": [
        [
          "accounting",
          "accounting#Noun"
        ],
        [
          "variable cost",
          "variable cost#English"
        ]
      ],
      "raw_glosses": [
        "(accounting) plural of variable cost"
      ],
      "tags": [
        "form-of",
        "plural"
      ],
      "topics": [
        "accounting",
        "business",
        "finance"
      ]
    }
  ],
  "word": "variable costs"
}

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "noun form",
        "head": "variable costs"
      },
      "expansion": "variable costs",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English non-lemma forms",
        "English noun forms",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Accounting"
      ],
      "form_of": [
        {
          "word": "variable cost"
        }
      ],
      "glosses": [
        "plural of variable cost"
      ],
      "links": [
        [
          "accounting",
          "accounting#Noun"
        ],
        [
          "variable cost",
          "variable cost#English"
        ]
      ],
      "raw_glosses": [
        "(accounting) plural of variable cost"
      ],
      "tags": [
        "form-of",
        "plural"
      ],
      "topics": [
        "accounting",
        "business",
        "finance"
      ]
    }
  ],
  "word": "variable costs"
}