"complementary color" meaning in English

{
  "forms": [
    {
      "form": "complementary colors",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "complementary color (plural complementary colors)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "complementary colour"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2021, Ruth Ozeki, The Book of Form and Emptiness, Canongate Books (2022), page 97",
          "text": "He knew that red and green were called complementary colors, which meant that they were opposites, but this made no sense because the word complement meant things that fit together, which was the opposite of opposite.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of complementary colour."
      ],
      "id": "en-complementary_color-en-noun-NvBJ8zr1",
      "links": [
        [
          "complementary colour",
          "complementary colour#English"
        ]
      ],
      "raw_glosses": [
        "(American spelling) Alternative form of complementary colour."
      ],
      "tags": [
        "US",
        "alt-of",
        "alternative"
      ],
      "wikipedia": [
        "Complementary color"
      ]
    }
  ],
  "word": "complementary color"
}

{
  "forms": [
    {
      "form": "complementary colors",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "complementary color (plural complementary colors)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "complementary colour"
        }
      ],
      "categories": [
        "American English forms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2021, Ruth Ozeki, The Book of Form and Emptiness, Canongate Books (2022), page 97",
          "text": "He knew that red and green were called complementary colors, which meant that they were opposites, but this made no sense because the word complement meant things that fit together, which was the opposite of opposite.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of complementary colour."
      ],
      "links": [
        [
          "complementary colour",
          "complementary colour#English"
        ]
      ],
      "raw_glosses": [
        "(American spelling) Alternative form of complementary colour."
      ],
      "tags": [
        "US",
        "alt-of",
        "alternative"
      ],
      "wikipedia": [
        "Complementary color"
      ]
    }
  ],
  "word": "complementary color"
}