"mp" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "?"
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      "expansion": "mp",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "– written on menus instead of a price to mean the price charged depends on the price of supplies, which may vary",
          "word": "market price"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
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          "kind": "other",
          "name": "English links with redundant wikilinks",
          "parents": [
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          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Ribeye steak – $20; Pork chop – $15; Lobster – mp"
        }
      ],
      "glosses": [
        "Initialism of market price – written on menus instead of a price to mean the price charged depends on the price of supplies, which may vary."
      ],
      "id": "en-mp-en-noun-rfEfz3~t",
      "links": [
        [
          "market price",
          "market price#English"
        ]
      ],
      "synonyms": [
        {
          "english": "as quoted",
          "word": "aq"
        }
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ]
    }
  ],
  "word": "mp"
}

{
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "mp",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "– written on menus instead of a price to mean the price charged depends on the price of supplies, which may vary",
          "word": "market price"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English initialisms",
        "English lemmas",
        "English links with redundant wikilinks",
        "English nouns",
        "English nouns with unknown or uncertain plurals",
        "English words without vowels"
      ],
      "examples": [
        {
          "text": "Ribeye steak – $20; Pork chop – $15; Lobster – mp"
        }
      ],
      "glosses": [
        "Initialism of market price – written on menus instead of a price to mean the price charged depends on the price of supplies, which may vary."
      ],
      "links": [
        [
          "market price",
          "market price#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
      ]
    }
  ],
  "synonyms": [
    {
      "english": "as quoted",
      "word": "aq"
    }
  ],
  "word": "mp"
}