"forever stamp" meaning in English

{
  "forms": [
    {
      "form": "forever stamps",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "forever stamp (plural forever stamps)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Finnish translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Swedish translations",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A postage stamp with no indicated monetary value and indefinitely valid for a given service, e.g. a domestic first-class letter under 20 grams."
      ],
      "id": "en-forever_stamp-en-noun-Buhdr5Aj",
      "links": [
        [
          "postage stamp",
          "postage stamp"
        ]
      ],
      "raw_glosses": [
        "(US) A postage stamp with no indicated monetary value and indefinitely valid for a given service, e.g. a domestic first-class letter under 20 grams."
      ],
      "synonyms": [
        {
          "word": "non-value indicator"
        },
        {
          "word": "no value indicator stamp"
        },
        {
          "tags": [
            "UK"
          ],
          "word": "NVI stamp"
        },
        {
          "tags": [
            "Canada"
          ],
          "word": "permanent stamp"
        }
      ],
      "tags": [
        "US"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "postage stamp indefinitely valid for a given rate class",
          "word": "ikimerkki"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "postage stamp indefinitely valid for a given rate class",
          "tags": [
            "Sweden",
            "neuter"
          ],
          "word": "valörlöst frimärke"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "postage stamp indefinitely valid for a given rate class",
          "tags": [
            "Finland",
            "neuter"
          ],
          "word": "fixvärdemärke"
        }
      ]
    }
  ],
  "word": "forever stamp"
}

{
  "forms": [
    {
      "form": "forever stamps",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "forever stamp (plural forever stamps)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "American English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Finnish translations",
        "Terms with Swedish translations"
      ],
      "glosses": [
        "A postage stamp with no indicated monetary value and indefinitely valid for a given service, e.g. a domestic first-class letter under 20 grams."
      ],
      "links": [
        [
          "postage stamp",
          "postage stamp"
        ]
      ],
      "raw_glosses": [
        "(US) A postage stamp with no indicated monetary value and indefinitely valid for a given service, e.g. a domestic first-class letter under 20 grams."
      ],
      "tags": [
        "US"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "non-value indicator"
    },
    {
      "word": "no value indicator stamp"
    },
    {
      "tags": [
        "UK"
      ],
      "word": "NVI stamp"
    },
    {
      "tags": [
        "Canada"
      ],
      "word": "permanent stamp"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "postage stamp indefinitely valid for a given rate class",
      "word": "ikimerkki"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "postage stamp indefinitely valid for a given rate class",
      "tags": [
        "Sweden",
        "neuter"
      ],
      "word": "valörlöst frimärke"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "postage stamp indefinitely valid for a given rate class",
      "tags": [
        "Finland",
        "neuter"
      ],
      "word": "fixvärdemärke"
    }
  ],
  "word": "forever stamp"
}