"sumando" meaning in Spanish

{
  "etymology_number": 1,
  "etymology_templates": [
    {
      "args": {
        "1": "es",
        "2": "ML.",
        "3": "summandus",
        "4": "",
        "5": "to be added"
      },
      "expansion": "Borrowed from Medieval Latin summandus (“to be added”)",
      "name": "bor+"
    }
  ],
  "etymology_text": "Borrowed from Medieval Latin summandus (“to be added”), gerundive of summō (“to add up, to sum”).",
  "forms": [
    {
      "form": "sumandos",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "sumando m (plural sumandos)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "es",
          "name": "Mathematics",
          "orig": "es:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "75 25",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "81 19",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "89 11",
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "addend"
      ],
      "id": "en-sumando-es-noun-Uk9hC9GB",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "addend",
          "addend"
        ]
      ],
      "raw_glosses": [
        "(mathematics) addend"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "sumando"
}

{
  "etymology_number": 2,
  "head_templates": [
    {
      "args": {
        "1": "es",
        "2": "gerund"
      },
      "expansion": "sumando",
      "name": "head"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "verb",
  "senses": [
    {
      "form_of": [
        {
          "word": "sumar"
        }
      ],
      "glosses": [
        "gerund of sumar"
      ],
      "id": "en-sumando-es-verb-RyQMSNwI",
      "links": [
        [
          "sumar",
          "sumar#Spanish"
        ]
      ],
      "tags": [
        "form-of",
        "gerund"
      ]
    }
  ],
  "word": "sumando"
}

{
  "categories": [
    "Pages with 1 entry",
    "Pages with entries",
    "Spanish countable nouns",
    "Spanish entries with incorrect language header",
    "Spanish gerunds",
    "Spanish lemmas",
    "Spanish masculine nouns",
    "Spanish non-lemma forms",
    "Spanish nouns",
    "Spanish terms borrowed from Medieval Latin",
    "Spanish terms derived from Medieval Latin"
  ],
  "etymology_number": 1,
  "etymology_templates": [
    {
      "args": {
        "1": "es",
        "2": "ML.",
        "3": "summandus",
        "4": "",
        "5": "to be added"
      },
      "expansion": "Borrowed from Medieval Latin summandus (“to be added”)",
      "name": "bor+"
    }
  ],
  "etymology_text": "Borrowed from Medieval Latin summandus (“to be added”), gerundive of summō (“to add up, to sum”).",
  "forms": [
    {
      "form": "sumandos",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "sumando m (plural sumandos)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "es:Mathematics"
      ],
      "glosses": [
        "addend"
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "addend",
          "addend"
        ]
      ],
      "raw_glosses": [
        "(mathematics) addend"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "sumando"
}

{
  "categories": [
    "Pages with 1 entry",
    "Pages with entries",
    "Spanish entries with incorrect language header",
    "Spanish gerunds",
    "Spanish non-lemma forms"
  ],
  "etymology_number": 2,
  "head_templates": [
    {
      "args": {
        "1": "es",
        "2": "gerund"
      },
      "expansion": "sumando",
      "name": "head"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "verb",
  "senses": [
    {
      "form_of": [
        {
          "word": "sumar"
        }
      ],
      "glosses": [
        "gerund of sumar"
      ],
      "links": [
        [
          "sumar",
          "sumar#Spanish"
        ]
      ],
      "tags": [
        "form-of",
        "gerund"
      ]
    }
  ],
  "word": "sumando"
}