"lelo" meaning in Basque

{
  "categories": [
    {
      "kind": "other",
      "name": "Mots en basque issus d’une onomatopée",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en basque",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Basque",
      "orig": "basque",
      "parents": [],
      "source": "w"
    }
  ],
  "derived": [
    {
      "word": "lelotegi"
    }
  ],
  "etymology_texts": [
    "D’une onomatopée, apparait sans sens précis dans une chanson sous la forme lelorilelo sara y leloa, équivalent du français lala lalalère."
  ],
  "lang": "Basque",
  "lang_code": "eu",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en basque de la musique",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en basque",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Refrain, chanson."
      ],
      "id": "fr-lelo-eu-noun-1QvCL4Pi",
      "topics": [
        "music"
      ]
    },
    {
      "examples": [
        {
          "text": "Betiko leloa, l’éternel refrain."
        }
      ],
      "glosses": [
        "Rengaine, refrain."
      ],
      "id": "fr-lelo-eu-noun-8ndeapjh"
    }
  ],
  "synonyms": [
    {
      "word": "errepika"
    }
  ],
  "word": "lelo"
}

{
  "categories": [
    "Mots en basque issus d’une onomatopée",
    "Noms communs en basque",
    "basque"
  ],
  "derived": [
    {
      "word": "lelotegi"
    }
  ],
  "etymology_texts": [
    "D’une onomatopée, apparait sans sens précis dans une chanson sous la forme lelorilelo sara y leloa, équivalent du français lala lalalère."
  ],
  "lang": "Basque",
  "lang_code": "eu",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        "Lexique en basque de la musique",
        "Wiktionnaire:Exemples manquants en basque"
      ],
      "glosses": [
        "Refrain, chanson."
      ],
      "topics": [
        "music"
      ]
    },
    {
      "examples": [
        {
          "text": "Betiko leloa, l’éternel refrain."
        }
      ],
      "glosses": [
        "Rengaine, refrain."
      ]
    }
  ],
  "synonyms": [
    {
      "word": "errepika"
    }
  ],
  "word": "lelo"
}