"ato-" meaning in Esperanto

{
  "etymology_templates": [
    {
      "args": {
        "1": "eo",
        "2": "da",
        "3": "atten",
        "t": "eighteen"
      },
      "expansion": "Danish atten (“eighteen”)",
      "name": "bor"
    }
  ],
  "etymology_text": "From Danish atten (“eighteen”).",
  "head_templates": [
    {
      "args": {
        "1": "eo",
        "2": "prefix"
      },
      "expansion": "ato-",
      "name": "head"
    }
  ],
  "hyphenation": [
    "a‧to"
  ],
  "lang": "Esperanto",
  "lang_code": "eo",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Esperanto entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "eo",
          "name": "Physics",
          "orig": "eo:Physics",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "eo",
          "name": "SI units",
          "orig": "eo:SI units",
          "parents": [
            "Units of measure",
            "Metrology",
            "Quantity",
            "Applied sciences",
            "Mathematics",
            "Sciences",
            "Formal sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "atto-"
      ],
      "id": "en-ato--eo-prefix-1MKbhLV0",
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "atto-",
          "atto-#English"
        ]
      ],
      "raw_glosses": [
        "(physics) atto-"
      ],
      "tags": [
        "morpheme"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈato]"
    },
    {
      "rhymes": "-ato"
    }
  ],
  "word": "ato-"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "eo",
        "2": "da",
        "3": "atten",
        "t": "eighteen"
      },
      "expansion": "Danish atten (“eighteen”)",
      "name": "bor"
    }
  ],
  "etymology_text": "From Danish atten (“eighteen”).",
  "head_templates": [
    {
      "args": {
        "1": "eo",
        "2": "prefix"
      },
      "expansion": "ato-",
      "name": "head"
    }
  ],
  "hyphenation": [
    "a‧to"
  ],
  "lang": "Esperanto",
  "lang_code": "eo",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        "Esperanto entries with incorrect language header",
        "Esperanto lemmas",
        "Esperanto prefixes",
        "Esperanto terms borrowed from Danish",
        "Esperanto terms derived from Danish",
        "Esperanto terms with IPA pronunciation",
        "Pages with 2 entries",
        "Pages with entries",
        "Rhymes:Esperanto/ato",
        "eo:Physics",
        "eo:SI units"
      ],
      "glosses": [
        "atto-"
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "atto-",
          "atto-#English"
        ]
      ],
      "raw_glosses": [
        "(physics) atto-"
      ],
      "tags": [
        "morpheme"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈato]"
    },
    {
      "rhymes": "-ato"
    }
  ],
  "word": "ato-"
}