"nonmain" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "non",
        "3": "main"
      },
      "expansion": "non- + main",
      "name": "prefix"
    }
  ],
  "etymology_text": "non- + main",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "nonmain (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms prefixed with non-",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2015 August 5, “Sexual Networks and HIV Risk among Black Men Who Have Sex with Men in 6 U.S. Cities”, in PLOS ONE, →DOI",
          "text": "In another study, 23% of Black MSM reported having serodiscordant unprotected anal sex with a nonmain male partner and 9% with a main male partner in the last 12 months.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Not main."
      ],
      "id": "en-nonmain-en-adj-pgtZWSIN",
      "links": [
        [
          "main",
          "main"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "nonmain"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "non",
        "3": "main"
      },
      "expansion": "non- + main",
      "name": "prefix"
    }
  ],
  "etymology_text": "non- + main",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "nonmain (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English terms prefixed with non-",
        "English terms with quotations",
        "English uncomparable adjectives"
      ],
      "examples": [
        {
          "ref": "2015 August 5, “Sexual Networks and HIV Risk among Black Men Who Have Sex with Men in 6 U.S. Cities”, in PLOS ONE, →DOI",
          "text": "In another study, 23% of Black MSM reported having serodiscordant unprotected anal sex with a nonmain male partner and 9% with a main male partner in the last 12 months.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Not main."
      ],
      "links": [
        [
          "main",
          "main"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "nonmain"
}