"mantissa" meaning in English

{
  "forms": [
    {
      "form": "mantissa"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Πληροφορική (αγγλικά)",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "μαντίσα"
      ],
      "id": "el-mantissa-en-noun-JBp2p3ij",
      "raw_tags": [
        "πληροφορική"
      ],
      "synonyms": [
        {
          "word": "significand"
        }
      ]
    }
  ],
  "word": "mantissa"
}

{
  "forms": [
    {
      "form": "mantissa"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Πληροφορική (αγγλικά)"
      ],
      "glosses": [
        "μαντίσα"
      ],
      "raw_tags": [
        "πληροφορική"
      ],
      "synonyms": [
        {
          "word": "significand"
        }
      ]
    }
  ],
  "word": "mantissa"
}