"ERA" meaning in Anglais

{
  "categories": [
    {
      "kind": "other",
      "name": "Lemmes en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Sigles en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Initiales."
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Nom commun",
  "raw_tags": [
    "Sigle"
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en anglais de l’armement",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en anglais",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Abréviation de explosive reactive armour ou explosive reactive armor : blindage réactif explosif."
      ],
      "id": "fr-ERA-en-noun-Mu1FGziq",
      "raw_tags": [
        "Armement"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en anglais du baseball",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Abréviation de earned run average : moyenne de points mérités."
      ],
      "id": "fr-ERA-en-noun-7jSIX5Mt",
      "topics": [
        "baseball"
      ]
    }
  ],
  "word": "ERA"
}

{
  "categories": [
    "Lemmes en anglais",
    "Noms communs en anglais",
    "Sigles en anglais",
    "anglais"
  ],
  "etymology_texts": [
    "Initiales."
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Nom commun",
  "raw_tags": [
    "Sigle"
  ],
  "senses": [
    {
      "categories": [
        "Lexique en anglais de l’armement",
        "Wiktionnaire:Exemples manquants en anglais"
      ],
      "glosses": [
        "Abréviation de explosive reactive armour ou explosive reactive armor : blindage réactif explosif."
      ],
      "raw_tags": [
        "Armement"
      ]
    },
    {
      "categories": [
        "Lexique en anglais du baseball"
      ],
      "glosses": [
        "Abréviation de earned run average : moyenne de points mérités."
      ],
      "topics": [
        "baseball"
      ]
    }
  ],
  "word": "ERA"
}