"-uno" meaning in Ido

{
  "etymology_text": "From un (“one”) and uno (“unit”).",
  "head_templates": [
    {
      "args": {
        "1": "io",
        "2": "suffix"
      },
      "expansion": "-uno",
      "name": "head"
    }
  ],
  "lang": "Ido",
  "lang_code": "io",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Ido entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 3 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "sablo (“sand”) + -uno → sabluno (“a grain of sand”)",
          "type": "example"
        },
        {
          "text": "grelo (“hail”) + -uno → greluno (“a hailstone”)",
          "type": "example"
        }
      ],
      "glosses": [
        "a single element"
      ],
      "id": "en--uno-io-suffix--rHuhftv",
      "related": [
        {
          "word": "peco"
        }
      ],
      "synonyms": [
        {
          "word": "grano"
        }
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-uno"
}

{
  "etymology_text": "From un (“one”) and uno (“unit”).",
  "head_templates": [
    {
      "args": {
        "1": "io",
        "2": "suffix"
      },
      "expansion": "-uno",
      "name": "head"
    }
  ],
  "lang": "Ido",
  "lang_code": "io",
  "pos": "suffix",
  "related": [
    {
      "word": "peco"
    }
  ],
  "senses": [
    {
      "categories": [
        "Ido entries with incorrect language header",
        "Ido lemmas",
        "Ido suffixes",
        "Pages using catfix",
        "Pages with 3 entries",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "sablo (“sand”) + -uno → sabluno (“a grain of sand”)",
          "type": "example"
        },
        {
          "text": "grelo (“hail”) + -uno → greluno (“a hailstone”)",
          "type": "example"
        }
      ],
      "glosses": [
        "a single element"
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "grano"
    }
  ],
  "word": "-uno"
}