"ero" meaning in Esperanto

{
  "etymology_templates": [
    {
      "args": {
        "1": "eo",
        "2": "-ero",
        "gloss": "element"
      },
      "expansion": "Back-formation from -ero (“element”)",
      "name": "back-form"
    }
  ],
  "etymology_text": "Back-formation from -ero (“element”).",
  "forms": [
    {
      "form": "eron",
      "tags": [
        "accusative",
        "singular"
      ]
    },
    {
      "form": "eroj",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "erojn",
      "tags": [
        "accusative",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ero (accusative singular eron, plural eroj, accusative plural erojn)",
      "name": "eo-head"
    }
  ],
  "hyphenation": [
    "e‧ro"
  ],
  "lang": "Esperanto",
  "lang_code": "eo",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Esperanto back-formations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Esperanto entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Esperanto terms suffixed with -ero",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 18 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "a bit, a single element, piece, or component of a large mass or collection"
      ],
      "id": "en-ero-eo-noun-kx6ZnNH2",
      "links": [
        [
          "bit",
          "bit"
        ],
        [
          "element",
          "element"
        ],
        [
          "piece",
          "piece"
        ],
        [
          "component",
          "component"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈero]"
    },
    {
      "rhymes": "-ero"
    }
  ],
  "word": "ero"
}

{
  "categories": [
    "Pages with 18 entries",
    "Pages with entries"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "eo",
        "2": "-ero",
        "gloss": "element"
      },
      "expansion": "Back-formation from -ero (“element”)",
      "name": "back-form"
    }
  ],
  "etymology_text": "Back-formation from -ero (“element”).",
  "forms": [
    {
      "form": "eron",
      "tags": [
        "accusative",
        "singular"
      ]
    },
    {
      "form": "eroj",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "erojn",
      "tags": [
        "accusative",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ero (accusative singular eron, plural eroj, accusative plural erojn)",
      "name": "eo-head"
    }
  ],
  "hyphenation": [
    "e‧ro"
  ],
  "lang": "Esperanto",
  "lang_code": "eo",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Esperanto back-formations",
        "Esperanto entries with incorrect language header",
        "Esperanto lemmas",
        "Esperanto nouns",
        "Esperanto terms suffixed with -ero",
        "Esperanto terms with IPA pronunciation",
        "Esperanto terms with audio pronunciation",
        "Pages with 18 entries",
        "Pages with entries",
        "Rhymes:Esperanto/ero"
      ],
      "glosses": [
        "a bit, a single element, piece, or component of a large mass or collection"
      ],
      "links": [
        [
          "bit",
          "bit"
        ],
        [
          "element",
          "element"
        ],
        [
          "piece",
          "piece"
        ],
        [
          "component",
          "component"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈero]"
    },
    {
      "rhymes": "-ero"
    }
  ],
  "word": "ero"
}