"-aro" meaning in Esperanto

{
  "etymology_templates": [
    {
      "args": {
        "1": "eo",
        "2": "la",
        "3": "-arium",
        "t": "-arium"
      },
      "expansion": "Latin -arium (“-arium”)",
      "name": "der"
    },
    {
      "args": {
        "1": "eo",
        "2": "ru",
        "3": "-арь"
      },
      "expansion": "Russian -арь (-arʹ)",
      "name": "der"
    }
  ],
  "etymology_text": "From Latin -arium (“-arium”) and Russian -арь (-arʹ).",
  "head_templates": [
    {
      "args": {
        "1": "eo",
        "2": "suffix"
      },
      "expansion": "-aro",
      "name": "head"
    }
  ],
  "hyphenation": [
    "a‧ro"
  ],
  "lang": "Esperanto",
  "lang_code": "eo",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Esperanto 1894 Universala Vortaro",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Esperanto BRO1",
          "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": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Words approved by the Akademio de Esperanto",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "arbo (“tree”) + -aro → arbaro (“forest”)",
          "type": "example"
        },
        {
          "text": "vorto (“word”) + -aro → vortaro (“dictionary”)",
          "type": "example"
        },
        {
          "text": "ŝtupo (“step”) + -aro → ŝtuparo (“staircase”)",
          "type": "example"
        },
        {
          "text": "amiko (“friend”) + -aro → amikaro (“circle of friends”)",
          "type": "example"
        }
      ],
      "glosses": [
        "a coherent collection for a noun"
      ],
      "id": "en--aro-eo-suffix-9K6cW5yI",
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "LL-Q143 (epo)-Lepticed7--aro.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/2/22/LL-Q143_%28epo%29-Lepticed7--aro.wav/LL-Q143_%28epo%29-Lepticed7--aro.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/2/22/LL-Q143_%28epo%29-Lepticed7--aro.wav/LL-Q143_%28epo%29-Lepticed7--aro.wav.ogg"
    },
    {
      "ipa": "[ˈaro]"
    },
    {
      "rhymes": "-aro"
    }
  ],
  "word": "-aro"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "eo",
        "2": "la",
        "3": "-arium",
        "t": "-arium"
      },
      "expansion": "Latin -arium (“-arium”)",
      "name": "der"
    },
    {
      "args": {
        "1": "eo",
        "2": "ru",
        "3": "-арь"
      },
      "expansion": "Russian -арь (-arʹ)",
      "name": "der"
    }
  ],
  "etymology_text": "From Latin -arium (“-arium”) and Russian -арь (-arʹ).",
  "head_templates": [
    {
      "args": {
        "1": "eo",
        "2": "suffix"
      },
      "expansion": "-aro",
      "name": "head"
    }
  ],
  "hyphenation": [
    "a‧ro"
  ],
  "lang": "Esperanto",
  "lang_code": "eo",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Esperanto 1894 Universala Vortaro",
        "Esperanto BRO1",
        "Esperanto entries with incorrect language header",
        "Esperanto lemmas",
        "Esperanto suffixes",
        "Esperanto terms derived from Latin",
        "Esperanto terms derived from Russian",
        "Esperanto terms with IPA pronunciation",
        "Pages with 2 entries",
        "Pages with entries",
        "Rhymes:Esperanto/aro",
        "Words approved by the Akademio de Esperanto"
      ],
      "examples": [
        {
          "text": "arbo (“tree”) + -aro → arbaro (“forest”)",
          "type": "example"
        },
        {
          "text": "vorto (“word”) + -aro → vortaro (“dictionary”)",
          "type": "example"
        },
        {
          "text": "ŝtupo (“step”) + -aro → ŝtuparo (“staircase”)",
          "type": "example"
        },
        {
          "text": "amiko (“friend”) + -aro → amikaro (“circle of friends”)",
          "type": "example"
        }
      ],
      "glosses": [
        "a coherent collection for a noun"
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "LL-Q143 (epo)-Lepticed7--aro.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/2/22/LL-Q143_%28epo%29-Lepticed7--aro.wav/LL-Q143_%28epo%29-Lepticed7--aro.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/2/22/LL-Q143_%28epo%29-Lepticed7--aro.wav/LL-Q143_%28epo%29-Lepticed7--aro.wav.ogg"
    },
    {
      "ipa": "[ˈaro]"
    },
    {
      "rhymes": "-aro"
    }
  ],
  "word": "-aro"
}