"live long and prosper" meaning in English

{
  "etymology_text": "From Star Trek, where it is a greeting used by the Vulcan aliens.",
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      "expansion": "live long and prosper",
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  "lang_code": "en",
  "pos": "phrase",
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          "ref": "[1984 November, Jean Lorrah, chapter 3, in The Vulcan Academy Murders (Star Trek; 20), New York, N.Y.: Pocket Books, →ISBN, page 22:",
          "text": "Sarek turned to the others, now offering the Vulcan salute. \"Captain Kirk, Dr. McCoy, may you live long and prosper.\" / \"Thank you, and the same to you, Mr. Ambassador,\" said Kirk, managing to force his hand into the proper position.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A greeting."
      ],
      "id": "en-live_long_and_prosper-en-phrase-wMikTRDM",
      "links": [
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          "greeting",
          "greeting#English"
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      "synonyms": [
        {
          "word": "LLAP"
        }
      ],
      "wikipedia": [
        "Star Trek",
        "Vulcan salute"
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    }
  ],
  "word": "live long and prosper"
}

{
  "etymology_text": "From Star Trek, where it is a greeting used by the Vulcan aliens.",
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      "expansion": "live long and prosper",
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  ],
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  "lang_code": "en",
  "pos": "phrase",
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          "ref": "[1984 November, Jean Lorrah, chapter 3, in The Vulcan Academy Murders (Star Trek; 20), New York, N.Y.: Pocket Books, →ISBN, page 22:",
          "text": "Sarek turned to the others, now offering the Vulcan salute. \"Captain Kirk, Dr. McCoy, may you live long and prosper.\" / \"Thank you, and the same to you, Mr. Ambassador,\" said Kirk, managing to force his hand into the proper position.",
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          "greeting",
          "greeting#English"
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          "word": "LLAP"
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        "Vulcan salute"
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  ],
  "word": "live long and prosper"
}